How to Clean Mouse Droppings Safely: A Step-by-Step Guide

Why Is Cleaning Mouse Droppings Risky?

Cleaning mouse droppings is risky because dry droppings, urine and nests release germs into the air when you disturb them. You do not get sick from looking at droppings: the danger starts when you sweep, vacuum or brush them and breathe in the dust. That is why every Canadian health authority tells you to wet them first.

Mouse Droppings and Hantavirus in Canada

Mouse droppings and hantavirus are linked through the deer mouse. According to HealthLinkBC, in Canada the virus has been found only in wild mice, mainly the deer mouse, while house mice, roof rats and Norway rats are not known to spread it. People get infected when virus particles from droppings, urine, saliva or nesting material are stirred into the air and inhaled. You cannot catch it from your pet, and the US CDC reports no evidence that it spreads from person to person in the United States.

Hantavirus pulmonary syndrome is rare, but serious. The Public Health Agency of Canada says symptoms can appear weeks after exposure and there is no vaccine, and NC State Extension describes the illness as a severe and potentially deadly lung disease. HealthLinkBC notes that about 1 out of 3 people with the illness in North America have died, and the Government of Alberta has reported confirmed cases and deaths since reporting began in 1989.

The risk is highest when you clean closed spaces where deer mice live: cottages, trailers, garden sheds, crawl spaces and buildings that have been shut for a while. Since many people cannot tell a deer mouse from a house mouse (University of Nebraska-Lincoln Extension), treat every pile of mouse droppings with the same care.

Other Germs in Mouse Droppings

Other germs in mouse droppings include the bacteria behind salmonella and leptospirosis, and the virus that causes lymphocytic choriomeningitis (LCM), according to UC IPM. Mouse urine is also a major allergen, which matters if someone in your home has asthma or allergies. A single house mouse can leave about 50 to 75 droppings a day (University of Nebraska-Lincoln Extension), so even a short visit leaves plenty to clean.

What Do You Need for Cleaning Mouse Droppings?

Cleaning mouse droppings safely takes a few simple supplies you can find at a Canadian hardware store or pharmacy. Gather everything before you start, so you do not walk through the area with dirty gloves looking for a missing item.

Gloves

Gloves are your first barrier. The Public Health Agency of Canada recommends rubber or plastic gloves. Choose a pair you can wash with disinfectant before taking them off, or disposable ones you can bag with the waste.

N95 Respirator

An N95 respirator protects your lungs much better than a basic mask. Like the Public Health Agency of Canada, HealthLinkBC points to N95-level protection: it recommends a well-fitting N95 mask or a respirator with P100 filters, and warns that a dust mask for insulating or painting is not the same thing. The Public Health Agency of Canada specifically calls for an N95-level respirator when you clean a confined space such as a crawl space, shed or closet. You can find them at safety supply stores and many hardware stores.

Eye Protection

Eye protection keeps splashes of bleach and dust out of your eyes. HealthLinkBC lists goggles with gloves and a mask as the basic cleanup gear, and Health Canada also advises rubber gloves.

Bleach Solution

A bleach solution is the cheapest effective disinfectant. Canadian health authorities all use the same ratio: 1 part household bleach to 9 parts water, for example 1 cup of bleach in 9 cups of water. Mix it fresh on the day you clean. Never mix bleach with other cleaning products: Health Canada warns that bleach combined with products containing ammonia or acids, such as glass cleaners, toilet bowl cleaners and even vinegar, can release toxic gases.

Store-Bought Disinfectant

A store-bought disinfectant works too, as long as it is approved by Health Canada. Look for the DIN (Drug Identification Number) on the label, which generally shows the product is authorized for sale in Canada, and follow the label for the contact time. HealthLinkBC notes that most general-purpose disinfectants and household detergents can be effective against hantavirus.

Disposal Supplies

Disposal supplies are simple: a roll of paper towels (or a mop you can disinfect afterwards), at least two sturdy plastic garbage bags, and a garbage can with a tight-fitting lid. Have soap and water nearby for your hands.

How to Clean Mouse Droppings Step by Step

How to clean mouse droppings comes down to one rule: soak them with disinfectant first, then wipe them up. These steps generally follow the Public Health Agency of Canada, HealthLinkBC and Alberta Health guidance.

Why You Should Never Sweep or Vacuum Mouse Droppings

Sweeping or vacuuming mouse droppings is the most common cleanup mistake. Both actions break up dry droppings and push tiny particles into the air, where you can breathe them in. The Public Health Agency of Canada and Alberta both say never to sweep or vacuum droppings, nests or dead mice. Wet cleaning only, from start to finish.

Step 1: Air Out the Space

Airing out the space comes first. Open the doors and windows and leave the area for at least 30 minutes before you start cleaning (HealthLinkBC, Alberta Health). This matters most in closed spaces like a cottage that has been shut all winter, a shed or a basement storage room. Keep children and pets out of the area until you are done.

Step 2: Put On Your Gear

Putting on your gear before you touch anything keeps germs off your skin and out of your lungs. Wear rubber or plastic gloves, as the US CDC advises, plus an N95 respirator and goggles. For a large mess, add long sleeves, long pants or disposable coveralls, and shoe covers.

Step 3: Soak the Droppings

Soaking the droppings is the step that kills the virus. Pour your bleach solution or disinfectant gently over the droppings, any urine stains and the surrounding area until everything is thoroughly wet. HealthLinkBC recommends pouring carefully rather than using a sprayer, and Health Canada says to dampen droppings before wiping up. Let it soak for 10 minutes, as the Public Health Agency of Canada advises.

Step 4: Wipe Up the Droppings

Wiping up the droppings is easy once they are wet. Use paper towels to pick them up, or a wet mop on a large floor area. Do not pick them up with bare hands, even with a paper towel, and do not scrape dry spots: as Health Canada advises, dampen them first.

Step 5: Double Bag the Waste

Double bagging the waste keeps the germs contained. Put the soiled paper towels and droppings in a plastic bag, seal it, place it inside a second bag and seal that one too. Put it in the garbage according to your local by-laws, ideally in a can with a tight-fitting lid.

Step 6: Disinfect the Surfaces

Disinfecting the surfaces removes what you cannot see. Mop or sponge the whole area with disinfectant, then clean every hard surface mice may have touched: floors, countertops, cabinets and drawers. If you used a mop, clean it afterwards with disinfectant and hot soapy water.

Step 7: Wash Your Gloves and Hands

Washing your gloves and hands is the last step. Wash your gloves in disinfectant and hot soapy water before you take them off, then wash your hands thoroughly with soap and water. If soap and water are not available, the Public Health Agency of Canada says to use a hand sanitizer with at least 60% alcohol. Bag disposable gloves and masks with the rest of the waste.

How Do You Clean Mouse Nests, Dead Mice and Soiled Items?

Mouse nests, dead mice and soft items need the same soak-first method, plus a few extra steps. Never move or shake them before they are wet.

Mouse Nests

Mouse nests are often packed with droppings and urine, so treat them as the dirtiest part of the job. Soak the whole nest and the area around it with disinfectant, wait 10 minutes, then lift it with paper towels and double bag it. Mouse nests are often made of shredded paper or other fibrous material, sometimes near heat sources such as water heaters, ovens and refrigerators (University of Nebraska-Lincoln Extension).

Dead Mice

Dead mice are cleaned up the same way: soak the mouse and the spot around it with disinfectant, then pick it up with a gloved hand or paper towel and double bag it. If it is in a reusable trap, HealthLinkBC suggests disinfecting the trap with 1 part bleach and 9 parts water after the mouse is removed. Our guide on how to set a mouse trap explains how to reset it safely.

Mice Poop in Kitchen Drawers and Cupboards

Mice poop in kitchen drawers and cupboards is one of the most common cases, and how to clean mice poop there follows the same soak-first method. Empty the drawer or shelf, throw out any open food or packaging with droppings on or near it, then soak, wipe and disinfect the inside, including corners and the underside of shelves. Wash dishes and utensils that were in the drawer with hot soapy water. Store dry food in sealed containers afterwards, and read what mice eat to see what draws them in.

Carpets and Upholstered Furniture

Carpets and upholstered furniture cannot be soaked and wiped like a counter. HealthLinkBC and the CDC recommend shampooing or steam cleaning them with a commercial disinfectant or a commercial-grade steam cleaner, after you have removed the visible droppings with the soak-and-wipe method. Do not vacuum first.

Laundry

Laundry that may be contaminated, such as clothing, bedding and stuffed animals, should be washed in hot water with detergent (HealthLinkBC, CDC). Dry it on a high setting or hang it in the sun. Wash the clothes you wore while cleaning the same way.

Books and Papers

Books and papers that cannot be wiped with disinfectant can be left outdoors in sunlight for several hours, or stored in a rodent-free area indoors for at least 3 weeks before final cleaning, according to the CDC. Then wipe them with a cloth lightly dampened with disinfectant while wearing gloves.

Cars

Cars need airing out too, because mice can leave droppings and nests in the cabin and the engine compartment, especially when a vehicle sits over winter. The CDC recommends opening the hood, doors and trunk for 20 minutes, and disconnecting the battery before you inspect the engine. Then soak, wipe and bag the droppings and nests as above. Our guide to mice in your car covers how to keep them out.

What Should You Do After Cleaning Mouse Droppings?

After cleaning mouse droppings, your job is to make sure no new ones appear. Cleaning removes the health risk for now, but it does not remove the mice.

Check for New Droppings

Checking the cleaned area over the next days tells you whether mice are still active. Fresh droppings on a spot you just disinfected mean the mice are still there. Our guide to the signs of a mouse infestation shows what else to look for.

Get Rid of the Mice

Getting rid of the mice is the only way to stop the droppings. Snap traps placed along walls where you found droppings are a simple, effective start. Follow our complete plan on how to get rid of mice.

Seal Entry Points

Sealing entry points keeps new mice from replacing the ones you remove. The Public Health Agency of Canada suggests closing openings with wire screening, steel wool, metal flashing or cement, and storing food and garbage in containers with tight-fitting lids. Our guide to finding mouse entry points shows where to look.

When to Hire a Professional

Hiring a professional makes sense when the job is bigger than a few droppings. The Public Health Agency of Canada suggests a professional cleaning company for heavy infestations, and the CDC recommends a professional when rodents are in ventilation ducts. Droppings in attic insulation are another common case: remediation companies often remove and replace heavily contaminated insulation using HEPA-filtered equipment. If someone in the home has been diagnosed with hantavirus, HealthLinkBC asks you to contact your local public health unit before cleaning. To learn what pest control companies handle, read do exterminators clean mouse poop, or get a quote from a recommended local exterminator through Pest Agent's referral form. More guides are in our mice hub.