Attic Cleanup and Insulation Removal After Wildlife
Help with droppings, soiled insulation and damage once animals are out of the attic.
Calls route by ZIP to an independent operator where one covers the address; where none does, they come to Local Core Group, which runs this site.
When the animals are gone, what they left is still in the attic: droppings, urine, nesting material and, often, insulation that is matted or soiled. Each animal brings its own health concern, and the CDC’s cleanup advice differs for rodents, for raccoons, and for bat and bird droppings. Ask on the first call whether cleanup and repair are part of the quote.
How do you clean an attic after animals?
It depends on the animal. For rodent droppings the CDC says to air the space out, soak droppings with a bleach solution or EPA-registered disinfectant, and never sweep or vacuum. For a raccoon latrine it recommends an N95-rated respirator in confined spaces. Large amounts of bat or bird droppings, the CDC advises, are a job for hazardous-waste cleanup companies.
What does cleanup involve for each animal?
| What was in the attic | The concern | What the CDC advises |
|---|---|---|
| Mice and rats | Viruses in urine and droppings, breathed in from contaminated air | Ventilate for 30 minutes first; soak droppings with bleach solution or an EPA-registered disinfectant for 5 minutes or as the label directs; never sweep or vacuum; bag soiled insulation; a half-mask respirator with a HEPA filter |
| Raccoons | Roundworm eggs in latrines, not visible to the naked eye and, with enough moisture, able to survive for years | An N95-rated respirator in confined spaces; mist the area to keep dust down; wipe with hot soapy water on a damp sponge; no propane torch indoors; boots that can be scrubbed or disposable booties |
| Bats | Histoplasmosis, caused by a fungus that lives in soil and spreads in bird and bat droppings that mix in soil | Large amounts cleaned by companies that specialize in hazardous waste removal |
| Birds | Histoplasmosis, as with bats | Same as bats for large amounts |
The CDC’s bleach solution for rodent cleanup is 1.5 cups of household bleach in 1 gallon of water, made fresh. For histoplasmosis, the CDC notes that construction workers can wear protective masks, like N-95s, and that large amounts of bird or bat droppings should be cleaned up by professional companies that specialize in hazardous waste removal.
Bird nests in vents and soffits come with rules about which birds can be moved; see bird removal.
Does attic insulation need to be replaced after animals?
Where rodents have soiled it, the CDC’s cleanup guidance says it comes out: exposed insulation contaminated with urine and droppings should be placed in plastic bags for removal.
How much comes out depends on how far the droppings and nesting spread, which is something an operator judges in the attic rather than over the phone. Replacement follows removal, after the entry points are sealed, so new insulation is not soiled by the next animal.
How cleanup and insulation show up in a quote is covered in the attic removal cost guide.
What gets repaired after an animal problem?
The openings, first. The repair that matters most is the one that closes the entry: a soffit section, a vent cover, a gap at the roofline, a chimney cap. That repair is what stops the next animal. The CDC’s raccoon guidance includes closing off access to attics, basements and crawl spaces, and its hantavirus guidance says wild rodents should be kept out of homes.
The National Park Service notes that rodents burrow into and rearrange attic insulation, and that gray squirrels may nest in it and chew electrical wires. Beyond that, the list depends on what the animal did inside: insulation that needs replacing, nesting material packed into vents, chewed vent ducting. Which of these an operator takes on varies, so describe what you have seen when you call, and ask whether removal, sealing, cleanup and repair are quoted together or separately.
Repairs to the structure happen from the outside and in the attic. This site does not arrange for finished walls or ceilings to be opened.
Common questions
Can I clean up bat guano myself?
Histoplasmosis is caused by a fungus that spreads in bat and bird droppings mixed into soil, and the CDC advises that large amounts be cleaned up by companies that specialize in hazardous waste removal. The CDC also notes that construction workers can wear protective masks, like N-95s, around such dust.
Is cleanup included when an animal is removed?
It depends on the operator. Removal, sealing, cleanup and insulation are separate pieces of work, and some operators quote them together while others price them one at a time. Ask on the call what the quote covers.
Why can’t I vacuum the droppings?
The CDC warns that vacuuming or sweeping rodent droppings, urine or nesting material can put droplets containing viruses into the air you breathe. Its method is to ventilate first and soak the droppings with a bleach solution or EPA-registered disinfectant before cleaning up, and to bag contaminated insulation.
Sources for this page
Each rule and figure on this page comes from one of these pages, read on the date given. Agency guidance is described as guidance; it is not presented as law.
- How to Clean Up After RodentsCDC
- How Raccoon Roundworm SpreadsCDC
- Preventing Raccoon RoundwormCDC
- Raccoon Latrines: Identification and Clean-upCDC
- About HistoplasmosisCDC
- Reducing Risk for HistoplasmosisCDC
- Migratory Bird Treaty Act of 1918USFWS
- Baylisascariasis (Raccoon Roundworm Infection) in Two Unrelated Children - Los Angeles County (MMWR 2025, vol. 74, no. 28)CDC (MMWR)
- Hantavirus PreventionCDC
- Rodent Exclusion Manual. Mechanical Rodent Proofing Techniques: a training manual for National Park Service Employees (Badzik, DiSalvo, Buttke, Chase; September 2014; 2019 accessible version)NPS (Natural Resource Stewardship and Science)
Michigan DNR pages
Linked for further reading. This page does not quote them or rely on them for its facts.
Accuracy and corrections
- Last reviewed
- , by Local Core Group, which runs this site
- How pages are made
- How this site's pages are written and checked
- Sources
- All sources and the dates they were read: sources page
This page is general information for Michiganders, not legal advice. Rules are taken from the agency that publishes them and linked to its own page; agency guidance is labeled as guidance, not law. Rules and guidance change, so check the linked page, the DNR or your local health department before acting on anything time-sensitive.
Corrections. If a rule, number or contact here is out of date, point to the agency page that shows it through the request form or by calling 616-512-2425. Each correction is checked against the source, and the page is dated when it changes.
Often comes up alongside this
Wildlife Exclusion and Entry-Point Sealing
One-way doors, then sealing every gap with durable material. The part of the job that stops a repeat.
Exclusion & sealing →Mouse and Rat Removal
Scratching in the walls or ceiling, and droppings. The gaps get sealed, and the droppings need a wet cleanup.
Mice & rats →Raccoon Removal
Usually one litter a year, an entry to close, and droppings that need careful cleanup.
Raccoons →Bat Removal and Exclusion
Many bats are federally protected, and the work is exclusion, timed around the summer maternity season.
Bats →Request help with attic cleanup and repair
Say what you are hearing or seeing and where. The call goes by ZIP to an independent wildlife control operator where one covers the address, and price and timing are set on that call.