How to Clean Up Mouse Droppings Safely (Hantavirus Precautions for Arizona Homes)

Finding mouse droppings in a cabinet, garage or attic is unpleasant, and in Arizona it is also worth handling carefully. Deer mice can carry hantavirus, and the way you clean up makes a real difference. The good news is that the safe method is simple.

Why droppings need careful cleanup

Hantavirus spreads when people breathe in tiny particles from rodent urine, droppings or saliva, or touch rodents or their nesting material. The Arizona Department of Health Services identifies deer mice as the main carrier. The virus does not spread from person to person.

Cases are uncommon. ADHS reports that Arizona has averaged zero to five cases a year since 2012. But the illness can be serious, and the biggest risk comes from stirring up dust in closed spaces like sheds, cabins, garages and attics.

What you need

• Rubber or plastic gloves
• A household disinfectant, or a fresh bleach solution: 1.5 cups of household bleach in 1 gallon of water (about 1 part bleach to 9 parts water)
• A spray bottle
• Paper towels
• Plastic garbage bags

Step by step: the CDC wet-cleaning method

1. Air out the space. Open doors and windows and let fresh air move through for at least 30 minutes before you start.
2. Put on gloves.
3. Spray the droppings and urine until they are soaking wet. Let the disinfectant sit for about 5 minutes, or as long as the product label says.
4. Wipe everything up with paper towels.
5. Throw the waste away in a covered garbage can.
6. Clean the area. Mop or sponge floors, countertops, cabinets and drawers with disinfectant.
7. Wash your gloved hands with soap and water or disinfectant, then take the gloves off and wash your bare hands with soap and warm water.

What not to do

• Don’t sweep droppings or nesting material.
• Don’t vacuum them with a regular vacuum.
• Don’t use a leaf blower or compressed air to clear them out.
• Don’t handle droppings, nests or dead rodents with bare hands.

Sweeping and vacuuming are exactly what the CDC warns against, because they put tiny particles into the air.

Dead mice and nests

Spray dead rodents and nesting material with disinfectant and let them soak for about 5 minutes. Then pick them up with paper towels or a gloved hand, place them in a plastic bag, and seal it inside a second bag before throwing it away.

Attics, crawl spaces and insulation

A few droppings in a drawer is a quick job. An attic or crawl space with droppings spread through the insulation is not. Contaminated insulation has to be bagged and removed, usually in a tight, dusty space. That is when it makes sense to bring in a professional. Our attic cleanup service removes contaminated material, disinfects and replaces insulation.

Stop them from coming back

Cleanup only lasts if the mice can’t get back in. ADHS recommends sealing holes larger than about a quarter inch. Look closely at garage doors, vents and the places where pipes and wires enter the house. Keep food, pet food and bird seed in sealed containers, and move woodpiles away from the walls.

If mice keep showing up, our mouse control and rodent exclusion services find the entry points and seal them.

When to talk to a doctor

ADHS says early hantavirus symptoms, such as fever, tiredness, muscle aches and headaches, can appear one to five weeks after exposure, and breathing problems can follow. If you feel sick after cleaning up after rodents, see a doctor and tell them about the exposure.