Bat urine stains. Stains around possible entry holes, cracks, and crevices.

Bat urine stains Common signs of bats in the house include rustling or squeaking noises at dusk STAINS. Dec 25, 2020 · Bat urine can corrode metal, damage wood, and carry diseases. With large numbers of bats, thick and hard stalactites and stalagmites of crystallized bat urine occasionally form. They are often small and may be difficult to spot at first. Ridge caps are another common bat entry point, and these can also be covered with fine mesh netting to keep bats out. Oil stains may be found where bats repeatedly rub against surfaces while accessing roost sites in crevasses. Common signs include: Droppings: Accumulations of bat guano near entry points or in the attic. I have a procedure that I use: After emptying the place, all the loose stuff gets mopped, vacuumed up, swept; you get the idea. Several wood beams in my house have been caked in guano (bat poop) and bat urine for decades. Strong ammonia smell: Bat urine has a distinct strong odor reminiscent of Oct 11, 2018 · Bats can squeeze into very small holes which will leave a dark stain on the siding or brick that is generated from the oily fur of bats. In addition, people can't get rabies from having contact with bat guano (feces), blood, or urine, or from touching a bat on its fur. Removing the bird or bat poo from your car There are several signs that indicate a bat infestation in the attic. The problem may be dealt with without compromising the entire structure. Entry Marks: Smeared stains around vents, windows, or cracks. Soon the roof begins to sag. Greasy Stains. In extreme cases, the eave ceiling may start leaking with brown fluid. This will help you see the fluorescent glow of the bat urine stains more clearly. These urine stain removers are specially formulated for hard to clean porous and soft surfaces such as upholstery and woodwork. Seal Off Access Points Bat poop in an attic can also create unsightly stains on ceilings over time. The urine started on the attic side of the drywall and seeped all the way through to the inhabited side of the drywall. Bat Droppings. Guano not only can spread diseases, but sufficiently heavy amounts can cause structural damage. Health and Structural Risks: Bat droppings (guano) can cause respiratory diseases like Histoplasmosis and weaken attic structures. Stains and discoloration: Over time, bat urine and droppings can cause stains and discoloration on walls and ceilings. Look for signs of bat activity, such as guano, urine stains, or oily rub marks left by their fur. Jan 12, 2012 · Are there unexplained stains on walls and ceilings? When bats are nesting in an attic or wall, stains from bat urine may be found on the wall or ceiling, or sometimes, in unused buildings, crystallized urine (a powdery white material) may pit furniture or wood within the building. One of the most obvious signs is the presence of bat droppings. Spotting the signs of a bat infestation is crucial for timely intervention. If you see the bats fly out of the house, or you find guano, urine, or oil stains, you can begin your in-depth search for the entry point. Damaged insulation may also lead to more moisture buildup and mildew growth, which can also mess up your Bat Infestation Signs: Professional Indicators for Homeowners. May 24, 2024 · Milky White Urine Stains: Bats may leave urine stains on windows, which appear milky white in color. In case if urine stains are on soft surfaces, there are more chances that you may need to replace it to get rid of bat It can also leave stains on walls when it leaks down from the nest of a bat colony. Grease and Dirt: Bats may leave grease marks and dirt around entry holes, cracks, and crevices in your property. We are the nations leading guano & bat remediation pros. You may also be able to smell it. When I use enzymes to treat pet smells, tobacco, hoarder homes, etc. You'll often find them below the primary entry point or where the bats roost during the day. Lots of men and women who have experienced a bat infestation or noticed a colony of bats will be quite knowledgeable about the number of droppings that these small creatures can create, and it isn't uncommon to observe a colony have a heap of many feet of droppings on the ground beneath where the bats hang. 12. Bat urine has a musty, ammonia-type smell, and the bigger the bat population, the more unavoidable and grave the smell becomes. In the worst case I've ever seen, a colony of about 3000 Little Brown Bats went unchecked in a Pennsylvania attic for many years. Read about Damage from bats in your Attic. If you Mar 5, 2025 · 1. In time these areas may turn lighter, as the moisture evaporates, leaving a bloom of salts. This is because bat urine contains ammonia, which, when dried, can leave a faint, whitish residue. As bats squeeze through their openings, they leave behind a black, greasy stain from resin that accumulates on the bat's skin. Due to the hazardous nature of the droppings and the fact that bats are common carriers of the rabies virus, property owners should never attempt to remove bat infestations or clean guano deposits on their own. BioShield is safe and non-toxic, and is applied through the use of a commercial-grade applicator. Bat Droppings are Hazardous Waste Bat Infestations in Attics: Bats roost in attics due to warmth and shelter, entering through gaps in roofs, vents, and chimneys. Bat feces measure ¼ inch in length with rounded ends and are typically dark brown or gray. Bat droppings and urine create a very unique smell that experts can detect immediately. There are many reasons why bat urine can pose several health and safety risks, as well as structural hazards around your home or business. Yo u may also smell the urine. Find the droppings, and you'll find where the bats are going in and roosting. The presence of bat guano in an attic can cause a serious health risk for homeowners. Many times their droppings and urine fall into a remote wall space and can remain undetected. In many cases the urine and the droppings will collect in the same place, and the urine will pick up some of the feces to further darken the color of the stain, to make it even more unsightly. Bat Prevention and Removal BioShield is an enzymatic cleaner used by professionals to help eliminate the urine and fecal markings left behind after a bat infestation. Stains and odors caused by urine and guano (excrement). Bats always crap all over the place, including in the air as they fly about and circle the building. Boards and beams saturated with urine acquire a whitish powder-like coating. Look for bat urine stains, splatters or dry, flakey dust-like remnants. Mar 5, 2018 · In addition to your attic, piles of bat guano are often found in places called feeding roosts. Bats emerging from a particular Mar 15, 2025 · Bat urine can cause unsightly and potentially harmful stains on stucco surfaces. However like many Daubenton’s bat roost sites it is smelly and a thick oily residue can be seen around the entrance, combined with an extensive urine stain. Bat urine can also leave behind stains that are difficult to clean. Bat urine is seen on walls as it leaks down from attics. You can also look for guano that is stuck to the sides of the chimney, piled on the roof, or in piles on the ground. . Another indicator is the presence of bat urine stains, which can be seen as dark spots on the walls or ceiling. Bat urine is primarily composed of uric acid, which is an insoluble Jan 10, 2025 · Before taking action, confirm that bats are the source of the issue. Oct 24, 2023 · The Tell-Tale Stains – Bat Stains Bats leave behind darker stains on walls or at entry or exit points. Inspect the walls and ceilings: Shine the blacklight along the walls and ceilings of the area where bats are suspected to be entering. These include behind your outdoor shutters or on your back porch. Although fresh urine from a single bat is relatively odorless, that of any moderate-sized colony is obvious. Bats often enter homes through small openings in the roof, attic vents, gaps around chimneys, loose siding, or holes where wires enter the house. Read more articles about bats: Bat urine removal and urine stain removal Is bat feces dangerous to touch or breathe? • Hopefully, you will not find a dead bat, but if you do and it is physically intact, you can support the Animal and Plant Health Agency (APHA) surveillance for rabies, a disease found in a small number of bats in the UK. Bats are nocturnal and leave the roost to feed at Oct 13, 2021 · Bat urine is seen on walls as it leaks down from attics. Removal of bat urine stain When removing bat urine stains, avoid using detergents with ammonia in them. Aug 19, 2021 · The bat urine stains appear as greasy patches on the surface. It is important to scrub these areas thoroughly with the enzyme-based cleaner as soon as possible to avoid structural damage to rooftops, beams, doorframes or stairs. The color results from the concentrated uric acid and other compounds present in the urine. What do bat urine stains look like on walls? Bat urine can leave a faint, milky streak on walls, sometimes described as looking like an exclamation mark. Plus, listen out for bat noises, such as high-pitched chirps, particularly at dusk or dawn, when bats are most active. Sand the affected area first and remove the black urine spot then. However, when it comes to bat urine fewer people are aware of these stains, and what you can actually do to clean them up. However, in some spots, places with join work, I figure it will be easier just to apply a cleaner. looks like a dense water or oil stain, and may be wet or dry. In some areas it's easy just to sand things down. Health Hazards Associated with Bat Guano. Bat Urine: Bat urine can sometimes appear as a white, barely visible splash resembling milk on surfaces like building exteriors or attic rafters. Problems Caused By Bat Urine Mar 4, 2025 · While fresh urine is clear, dried bat urine typically leaves a white, yellowish-brown, or brown residue. Gutters may also clog after a long period of a bat infestation. Bats are also potential carriers Most of the homeowners’ report bat urine and oil signs on outside walls of the property. If you have a larger colony the smell of all this becomes even more difficult to live with. Jul 7, 2019 · What does bat pee smell like? If you suspect that you have bats in your home your suspicions will be validated if you smell bat urine. Aug 19, 2024 · Eason says brown and black stains around your home—especially on walls and ceilings—are another sign bats are making their residence in your attic, due to discoloration in their urine. Additionally, guano may accumulate on window sills, porches, or decks. Roof vents, gables, and ridge caps are common points of entry for bats, so check those first. Bat guano stains walls and ceilings and is usually a sign of infestation. Bat Urine Removal And Urine Stain Removal One of the first things you can do is look for the droppings. Guano Stains. ) Mar 11, 2025 · Dark stains: Bat urine can create discolored patches on carpets. Check your attic for droppings. They But cleaning urine stains, more so bat urine stays is a tricky task because of the high uric concentration that makes majority of the common cleaning chemicals a white elephant. If your eaves are waterproof, they will trap the feces, urine, and even hold dead bats. Cleaning-up bat droppings and urine. Their presence causes noise, odors, and health risks. Dec 2, 2022 · Ammonia from bat urine emits a very strong odor once there’s an infestation, and it smells just like a urine-soaked cat litter box. Bat urine smells like ammonia, this smell can be very overpowering. To find out more, or request a dead bat pack, see the Bat Conservation Trust website Although this particular project was in Massachusetts we also provide bat droppings removal in Rhode Island as well. It contains ammonia and can certainly be described as having an odor. This is due to the steroid contained in bat droppings that corrodes materials over time, leaving your property walls stained and potentially damaged. First, let’s discuss the contents of bat urine. 4 His experiments have led to a deeper understanding of the situation and the extent to which the damage resulting from bat droppings and Jun 15, 2016 · Bat Guano and Urine Stains - Evidence of Bats. These are probably urine stains and must be removed, as bat urine is highly corrosive to wood and metal. Urine stains are visible on lighter colored chimney sidings and other materials, so look up towards the top of the chimney along the walls and on the roof for urine stains. Telltale signs of bats roosting in your home include: Bat droppings on walls, floors, or ceilings; Stains from bat urine on walls or ceilings; A strong, musty odor, especially in the attic Preventing Future Bat Urine Stains The truth is that in order to prevent the bats from continuing to build up bat urine which will lead to continuing stains, you do need to get rid of the bats, or at least get them to move to a new roost outside of the building where they are causing problems. These stains are often an early indicator of bat activity and may signal the presence of other problems requiring immediate attention. Understanding the signs of bat infestation is essential for every homeowner to protect their property. Removing these stains requires a careful approach to avoid further damage. People can't get rabies just from seeing a bat in an attic, in a cave, at summer camp, or from a distance while it is flying. And bats love to nest in high-up places in and around buildings, underneath eaves, and in attics and garages if they can gain access. Stains can become more pronounced over time, especially with exposure to light. Mar 5, 2025 · Stains: Bat urine can create a milky white, downward-streaking residue on walls, resembling an exclamation mark. 4) Look for bat droppings (“guano”) on the patio or ground below any openings found on the outside of your home, and in the attic or other area where you suspect they are Urine Stains: Bat urine can leave noticeable stains and a strong ammonia-like odor, especially in attics or on walls. The problem begins when dried bat guano is disturbed and "bat guano dust" is created in an attic. Call 804-729-9097 For Bat Guano Cleanup in Richmond, Virginia. Bats can inhabit your attic, chimney or walls and in order to remove bat urine and bat stains, first of all you need to get rid of bats which require time and effort. Grease and Rub Marks: Bats have oil on their fur. This guide will provide a step-by-step process to effectively eliminate bat urine stains from stucco, ensuring a clean and safe environment. If you only paint over this, then 1) the urine will eventually seep right through the paint again and 2) the smell of that urine – still trapped in the drywall – will remain. If bats can be attracted to artificial roosts using a chemical lure, this could have important implications for bat conservation and management. Noise: If you suspect bats are entering your home, you might want to listen during dawn or dusk. (If enough urine collects, stalactites and stalagmites will appear. The first step in bat-proofing your home is identifying where bats are entering. The presence of bat droppings, urine stains, odors, and scratching noises in attics or walls are professional indicators of bat infestation in homes. But believe it or not, bats do indeed produce droppings, and as it turns out, they can be pretty dangerous. I need a cleaning product that is a good surfactant, but which isn't going to have a negative interaction. Small urine stains and/or scattered droppings in several locations 3 3 Large dropping accumulations and/or urine stains obvious and widespread Nov 15, 2022 · The next effective cleaning technique to remove black urine stains from hardwood floors is using wood bleach products. After you have sanitized the area you will see that stains may remain. Once you complete the mission of bat exclusion, you will need to remove both bat feces and urine. However, when they decide to make your home theirs, it’s a different story. Oct 24, 2023 · Guano is a significant health hazard and can accumulate quickly, creating a foul smell and even causing structural damage over time. In some cases, urine trails can be seen on the walls or See full list on fcapgroup. Bats can squeeze through gaps as small as 3/8 of an inch, so inspect your attic, basement, and walls for any cracks or holes. Another typical spot where stains might accumulate, especially in more extensive bat colonies that have been established for some time, is on the wall below where the Mar 15, 2025 · Bat infestations can cause significant issues for homeowners, one of which is unpleasant staining on ceilings due to bat urine. Rotting droppings, as well as any other organic material that accumulates because of an infestation, will cause stains to form around the edges of your ceilings from seepage or mold growth. Addressing the Issue If you've got a colony of a thousand bats in your attic, multiply 20-30,000 bat droppings times the number of days the bats are in there, and though the droppings are small, you can wind up with a huge buildup. There may also be urine stains and droppings on the siding below the opening. Staining: Bat urine and guano can cause stains on the exterior of your home, particularly on walls and siding, reducing curb appeal and property value. Sep 27, 2021 · If there are bats in your attic for a long period of time, there is a chance that you will see signs on your ceiling. Bats also have a gland in their chests that produces an oily substance that waterproofs and conditions their fur. Urine stains may be found at or below roosts. Bat guano and urine has a strong pungent odor as well and will creep into the living area of the home in a short period of time. A common tell-tale sign of long-term bat intrusion is stained walls and strong odor presence within certain areas of the home. This video shows what years of bats roosting on a building and the contaminants they leave. Mar 12, 2014 · Openings used by bats may be surrounded by dark smudge marks from oils in the bats’ hair. These stains will be dark-colored and may wear away at wood over time. The staining is Mar 8, 2025 · Therefore, it’s best to treat all bat droppings as potentially contaminated and take appropriate safety precautions. If you have ever had a bat in your home or known someone who has then you are quite aware that these can be some of the most disgusting and messy animals on earth. A large pile of guano is easy to spot as it covers an attic floor or insulation. Check if your home insurance can help you to pay for some repairs and cleanup of bat urine and urine stains. Aug 29, 2023 · What Are the Common Signs of a Bat Infestation? When you start to notice signs of bats in your home, it is time to call humane bat removal. Learn how to identify it, avoid it, and get rid of bats that leave it behind. Odor: A strong ammonia-like smell caused by bat urine. Only the action of enzyme-based cleaning agents is able to remove the urine as well as reduce or eliminate the stench from this urine, which is primarily caused by Bat urine can sometimes be seen on the outside of a building, on attic rafters and elsewhere around the house. The musty, acrid smell of bat droppings, along with the stains they leave on walls or ceilings, is a sure sign of bat infestations. Professionals should always be contacted. Bats urine is highly acidic and leaves noticeable white stains on bridge structures in the areas that they roost. Bat urine is more difficult to see, but fresh droplets will appear darker as the moisture is absorbed. You may also see stains from bat urine on the walls or ceiling. If you see these stains, you might have bats in the attic. In fact, you may want to call professionals at the first signs of increased activity around your house. Go back to the How to get rid of bats page or email us if you have any other questions about Bat urine and urine stain removal Dec 5, 2023 · Guano (bat droppings): Bats tend to leave behind guano, which resembles small, elongated pellets or droppings. Visual Sightings: Seeing bats fly out from your home at dusk is a clear indication of a roost. The same is true for urine stains; if you see a lot in one area, it is likely that the bats are entering and exiting very near that spot. This is bat urine A thick layer of accumulated dust and grime >was removed relatively easily using first dry cleaning methods and >then a 15% tac solution, but white staining--which I believe is >caused by bat-urine--has proved impossible to clean with all the >usual solvents. Everyone else joined in and told him to F off, he was gone minutes later. Guano may even sparkle in the light, as it contains partially-digested insect exoskeletons. This bat urine is typically going to look like a splash of milk leaving a white, barely visible residue. 4. Bat Guano: This is one of the most noticeable signs. This can be particularly noticeable around roosting areas. They roost upside down during the daytime, sleeping and dropping their waste below, leaving piles of guano and urine to clean up. com Mar 10, 2025 · Odor: Accumulation of bat urine and guano can create a persistent unpleasant odor, which can permeate your home and be difficult to eliminate. Feb 20, 2015 · Small amount of droppings/urine stains in only one location Dropping accumulations several inches thick in several locations. Grease Marks: Bats can leave greasy, dark marks around entry and exit points where their fur touches. Bats will also create noticeable urine stains anywhere they roost, including areas inside or outside of your home. Sep 22, 2023 · Guano (bat feces) is shinier than rodent droppings, with a speckled appearance. If your property is infested with bats, you might notice bat droppings, also known as guano. Urine stains: Look for milky-white urine stains on windows or near obvious entry holes, like cracks and crevices. Look for any glowing spots or streaks, as these could indicate the presence of bat urine. Other times it quickly stains ceilings in living areas giving the residents tell tale evidence that something needs to be done. Additionally, if there are Urine Stains: Bat urine can cause noticeable stains on building materials. Common areas to look include the siding at roof peaks, gables, soffits, vents, and flashing. They Bats are attracted to warm, dark, quiet spaces like attics, chimneys, and wall cavities; Signs of bat presence include guano (droppings), urine stains, noises, and visible bats flying in/out; Bats should not be handled directly due to disease risks like rabies; Proper exclusion and removal methods are essential to safely address bat infestations Bats leave droppings at the entrance to the roost area that can accumulate on walls, windowsills, or porches or on areas below the entrance to the roost. bat poop) were also observed under accessible bat boxes and bats could be heard conducting social chirps within the bat boxes. Guano looks like mouse droppings, but larger. info@getbatsout. Many homeowners begin to suspect bat infestation and guano problems with odor and stain detection. It is crucial to note that stains from bat urine will differ from the dark, oily marks caused by the resin on a bat’s skin. Bat guano stains walls and ceilings and has an acrid smell. Be very careful while doing this as bat urine and feces contain disease-causing microorganisms. It’s advisable that you wear rubber gloves and a face mask to protect yourself from possible infection. Like sounds, smells are also difficult to explain . Squeaking sounds: Bats and mice create similar sounds when roaming around wall cavities, but bats are primarily active at night. The hard surfaces can be cleaned by using disinfectant cleaner solutions and then the stains must be removed with scrubbing action. Contact us if you notice any of the following conditions: Mouse-like droppings under eves and overhangs. Stains around possible entry holes, cracks, and crevices. Urine Stains: Bat urine can cause noticeable stains on building Bat Infestation Clean Up Richmond Virginia 804-729-9097 The Dangers of Bat Urine. The odor increases during damp weather. Bats, with their nocturnal flights and silent presence, can be fascinating creatures. Does urine ruin a paint job easily or can be okay if washed off immediately? For those wondering, I told the guy what he did and he started getting defensive as hell. In addition to leaving disgusting stains, bat droppings, or guano, can become a serious hazard. Recognizing these signs early on allows for timely intervention to repel and relocate bats without harming them. Usually, the wood bleach products work best on lighter urine stains but with little effort, you can use it to eliminate black urine stains from hardwood floors. Roosting evident throughout structure. Likewise, bat droppings may break apart upon dropping or sitting for some time. For bats in the attic, their odors are generally described as having an ammonia aroma. When they fly in and out of gaps in your roof, window, or chimney, they leave grease stains around the area. Squeaking or scratching noises in walls just before dusk and dawn. Thorough cleanup will get rid of bat droppings (guano), dead bats, and the awful smell of bat urine. It is an oily substance that leaves streaks on walls and spots on ceilings that are saturated from above. These droppings are usually small and have a distinctive appearance, resembling grains of rice. Bat urine also causes etching of polished surfaces and staining of light-coloured fabric and porous stone such as marble and alabaster. This can happen often within just a few minutes, particularly with bats as their poop seems to be very acidic. Bat guano, urine, and other droppings are likely to build up and soak through and stain your patches of your ceiling a brown or yellow colour. It can have an ammonia-like odor, which is more noticeable with Sep 5, 2022 · Seeing bat guano and urine; Smelling a strong ammonia stench from their waste; Hearing active bats during the night or early morning; Noticing small, brown-colored stains around the cracks and openings in the home’s structure; Observing bats soaring from or near your home around dawn and dusk. You’ll notice most bat or bird poo is made of uric acid (that icky white stuff) which can quickly etch into your paint work depending on what the bat or bird has been eating. Bat droppings, or guano, are small, dark, and pellet-like. If you suspect bats are inside your home, check near your deck, porch, windowsills, attic, and siding for these stains. Look for dark spots on wood near places where bats might sneak into your home, particularly around frames. milky white urine stains on windows; stains around entry holes, such as cracks and crevices; mouse-like droppings under eaves and overhangs; stains and odors caused by urine and guano; noises such as squeaking, scratching and crawling in attics and walls shortly before dusk and dawn; and; grease and dirt. It’s essential to note that this residue is often subtle and may not always be immediately obvious. Milky white urine stains on windows. Continue reading to learn what you need to know about bat guano, plus how to get rid of nuisance bats with responsible bat control strategies. The main concern with bat urine does not relate to human health but the fact it contains high concentrations of uric acid which can corrode metal. In extreme cases, it may be possible for a bat specialist consultant to apply for a licence allowing the legal exclusion of bats. Apart from forming unsightly deposits and stains, bat urine and droppings may Bat urine or guano stains are usually dark, muddy-looking stains and the most likely spot to discover them is beneath the bat’s roost, which is usually in the attic of a home. These stains might appear darker than the surrounding material. com; CALL NOW (877) 264-2287 Toxic Urine Odor. Some of the most obvious signs of a bat infestation include: Milky white urine stains on windows or Removing Bat Urine and Urine Stains. There is no evidence that bat droppings or urine have caused disease or harm in the UK but when cleaning up do wear gloves and a dust mask, and wash hands afterwards. Here, we’ll explore seven telltale signs that might indicate you have winged intruders sharing your space. Jan 28, 2023 · Bat urine and guano can also stain wood, drywall, and other materials, especially when there’s a significant infestation and, therefore, a significant amount of waste produced. Extreme care should be taken in removing bat droppings. Lingering odors in the living quarters of the residence is a tell-tale sign of an animal infestation. Bat urine is very unlikely to cause issues in properties such as dwellings, as typically the amount of urine produced by bats is negligible, even in the summer months when bats are active. If you notice a pile of droppings in or around your home, it’s a strong indication of a bat infestation. Ammonia Odors ↔ Y N Along with bat urine and droppings come odor. Ceiling stains: As they stay inside your attic, bats can damage your insulation and cause urine and droppings to stain your ceiling. At the entrance point to the Sep 2, 2020 · Some anecdotal reports suggest that guano stains can attract bats to a bat house, though others have argued that such stains have no effect [19,20]. e. Jan 16, 2025 · If bats have decided to move into your attic, or around your property, you’ll likely see or smell their feces and urine. Noises: Rustling or chirping sounds, particularly at night. You can watch your house at dusk and wait for the bats to exit your house on their nightly hunt for food. Piles of bat guano (i. Bat Poop Odor and Stain Detection. Sometimes they seem to gleam in the light, due to the large amount of insect exoskeletons in the droppings. Are you searching for Bat Urine Stains png hd images or vector? Choose from 53000+ Bat Urine Stains graphic resources and download in the form of PNG, EPS, AI or PSD. Not all roosts are as obvious as this Andrew Cowan 2003 Whenever possible, the bat should be captured and sent to a laboratory for rabies testing. Jul 1, 2019 · Bats love to make their way into homes because of the consistent temperatures and protection they are afforded. The urine stains will be white and have a strong odor of ammonia. You can use commercial hydrogen peroxide based urine stain removers such as Clorox™ for better results. Black Stains Near Frames Bats crawl into homes through small cracks and crevices around attics. However, there are some occasions where a build-up of urine can occur if the roost is large or awkwardly situated. Health and Safety Concerns The most recent and in-depth study was by Dr James Hales, who analysed the content of bat droppings and urine and tested their effects on materials, both in situ and in a controlled laboratory environment. The greater part of the smell originating from a bat infestation isn't created by the guano, but by the bats themselves and their urine. bxqz nvrig kcdvksy ahwifw dsgs xkoo vuazkt nwemz qla ydiy iistwn qbum eedfy vxl tcs