How to Clean Up Mouse Droppings Safely (Hantavirus)

Open the doors and windows for 30 minutes, soak the droppings with a disinfectant or bleach solution, wait 5 minutes, then wipe them up with paper towels. Never sweep or vacuum them. That is the procedure of the Centers for Disease Control and Prevention (CDC), and it exists because stirring up fresh rodent urine, droppings or nesting material can put hantavirus into the air.

Why sweeping and vacuuming are the mistake

Hantavirus can reach people through the air. CDC explains that when fresh urine, droppings or nesting material from an infected rodent is stirred up, the virus can get into the air, and people become infected by breathing it. The virus can also enter through cuts in the skin or through the eyes, nose or mouth.

A broom or a vacuum does exactly the stirring CDC warns about. Its cleanup guidance says not to vacuum or sweep rodent urine, droppings or nesting materials, because that can send tiny droplets containing viruses into the air.

CDC’s cleanup steps

CDC’s steps, in the order it gives them:

1. Air the space out first. Open all doors and windows for 30 minutes before cleaning, and leave the area while it ventilates.
2. Wear gloves. CDC specifies rubber or plastic gloves.
3. Wet everything down. Spray urine, droppings and nesting material until soaked, using an EPA-registered disinfectant or a freshly mixed bleach solution: 1.5 cups of household bleach in 1 gallon of water, about 1 part bleach to 9 parts water.
4. Let it soak. Wait 5 minutes, or as long as the disinfectant label directs.
5. Wipe, do not sweep. Pick up the material with paper towels and throw them in a covered garbage can that is emptied regularly.
6. Disinfect the area. Mop or sponge the floor and nearby surfaces with disinfectant.
7. Wash in order. Wash gloved hands, remove the gloves, then wash bare hands.

A dead rodent or a nest gets the same treatment: CDC says to spray it and the surrounding area with disinfectant and let it soak for 5 minutes, then place it in a plastic bag along with any used traps, put that bag inside a second one, and tie the second bag shut.

Some items need their own handling. CDC advises washing contaminated bedding and clothing in hot water, shampooing carpets with a commercial disinfectant or a steam cleaner, and setting contaminated books and papers outdoors in sunlight for several hours, or leaving them in an indoor space with no rodents for at least three weeks.

How serious the risk is

Hantavirus disease is rare and severe. CDC counts 890 cases reported in the United States from the start of national surveillance in 1993 through the end of 2023. Of those patients, 35% died, and 94% of the cases occurred west of the Mississippi River.

Cases can cluster. University of Arizona Cooperative Extension reports six confirmed cases in Arizona in 2023 and eleven in 2024, against eleven cases, four of them fatal, over the seven years from 2016 through 2022.

Not every mouse carries the virus. CDC identifies the deer mouse as the carrier of the hantavirus that most often causes hantavirus pulmonary syndrome in the United States. University of Arizona Extension lists deer mice as the primary reservoir, adds that wood rats and hispid cotton rats can also carry hantavirus, and calls house mice unlikely hosts. It still recommends controlling house mice for other health reasons.

One of those reasons is lymphocytic choriomeningitis virus (LCMV). CDC says the common house mouse spreads it through fresh urine, droppings, saliva or nesting material, that pregnant women infected with LCMV face a higher risk of miscarriage, and that the infection can pass to the fetus. CDC’s cleanup steps are written for rodent waste in general, not for one virus.

Symptoms and when to see a physician

CDC says early symptoms of hantavirus disease appear 1 to 8 weeks after contact with an infected rodent and include fatigue, fever and muscle aches, with breathing problems developing four to 10 days after that first phase. CDC’s advice is to see a physician immediately if hantavirus disease is suspected, and to mention the possible rodent exposure. Anyone pregnant who has handled rodent waste can raise the LCMV question with a physician. This page covers cleanup only; diagnosis and treatment belong with a doctor.

Heavy infestations and closed-up spaces

A shed, cabin, attic or crawl space with many droppings is a bigger job than a kitchen cabinet. For heavy infestations, CDC’s guidance calls for more protection than gloves: coveralls, rubber boots or disposable shoe covers, protective goggles, and a half-mask air-purifying respirator with a HEPA filter, used under local and state fit-testing requirements. People hired to do such cleanup as part of their work, CDC adds, should contact their local or state health department.

Stop the droppings at the source

Cleaning without removing the rodents means cleaning again. CDC recommends traditional snap traps and advises against glue traps and live traps, because those traps can frighten rodents into urinating, which raises the chance of getting sick.

CDC’s placement advice: set traps on the floor against the wall, with the baited end touching the wall so the trap forms a “T,” and put them where rodent signs appear, such as behind appliances, in cabinets, attics and basements. CDC calls for a small amount of bait, checking the traps daily, and checking the bait every week, refilling or moving it as needed, for at least 15 days. If trapping does not resolve the infestation, CDC lists a poison bait station or professional help as next steps, and says baits and traps must be kept away from children and pets.

Sealing entry points is the other half. University of Arizona Extension advises filling gaps and cracks that rodents can use, with materials such as steel wool, rodent fabric or concrete, and favors snap traps and enclosed traps over glue and live traps for the same reason CDC gives.

When to call a professional, and what to ask

Call a licensed pest control company when droppings keep appearing despite trapping, when the contaminated area is large or hard to reach, such as an attic or crawl space, or when someone in the household is pregnant, given the LCMV risk CDC describes. EPA suggests asking to see the company’s license, and calling your state pesticide regulatory agency with any concerns. Questions worth asking:

• Where are the rodents getting in, and will you seal those openings, not only set traps or bait?
• Which traps or bait stations will you use, and how will they be secured from children and pets?
• Who removes the nests and droppings, and what protective equipment will that person wear?
• Is any insulation or stored material contaminated enough that it should be removed?
• How many follow-up visits will confirm that the rodents are gone?