Last updated: October 22, 2026
Short answer: Don’t sweep or vacuum them. Air the room out, put on rubber gloves and a mask, soak the droppings with a bleach solution (1 part bleach to 9 parts water) for about 10 minutes, then wipe them up with paper towels and bag them. Next, figure out whether you have mice or rats and where they’re getting in.
Are these mouse droppings or rat droppings?
Mouse droppings are small, about 3 to 6 mm, like dark grains of rice with pointed ends. They are usually scattered along walls, in drawers and cupboards. Rat droppings are much larger, about 12 to 18 mm, with blunt ends, and are often found in clusters. Fresh droppings are dark and soft. Old ones are grey and crumble.
| Mouse | Rat | |
|---|---|---|
| Size | 3 to 6 mm | 12 to 18 mm |
| Shape | Thin, pointed ends | Thick, blunt or capsule ends |
| Where | Scattered: cupboards, drawers, along baseboards | Grouped: garages, basements, near burrows and garbage |
| Amount | Many (a mouse leaves dozens a day) | Fewer, but larger |
Still not sure? See Mice vs Rats: How to Tell Which One You Have. Small, dry, shiny droppings that crumble to dust in the attic may be bat guano, not rodent droppings. See our bat guano guide.
Why shouldn’t you sweep or vacuum droppings?
Sweeping and vacuuming break dry droppings into dust that you can breathe in. Rodent droppings and urine can carry bacteria such as Salmonella. In Canada, deer mice can carry hantavirus, which spreads mainly by breathing in contaminated dust. Cases are rare, but the safe cleanup method costs nothing extra.
How do you clean up mouse droppings safely?
- Ventilate. Open windows and doors for at least 30 minutes before you start, and leave the area.
- Protect yourself. Wear rubber or nitrile gloves. A properly fitted N95-type mask is recommended for anything more than a few droppings.
- Soak. Spray droppings and urine spots with a mix of 1 part household bleach to 9 parts water, or a disinfectant labelled for this use. Let it sit about 10 minutes.
- Wipe. Pick up the wet droppings with paper towels. Don’t scrape them dry.
- Bag. Seal waste in a plastic bag, then put it in a second bag and into the garbage.
- Disinfect. Mop or wipe the surrounding floors, counters and cupboards with the same solution.
- Wash. Remove gloves carefully and wash your hands thoroughly.
For large amounts, attic insulation full of droppings, or a crawl space, hire a professional with proper protective equipment.
What should you do right after cleaning up?
Find out how the rodents are getting in and what they’re eating. Clean up, then watch the same spots for fresh droppings over the next few days. New droppings mean rodents are still active. Check under sinks, behind appliances, along basement walls and in the garage. Store food in sealed containers and remove pet food overnight.
Check for these other signs: – Gnaw marks on food packaging, baseboards or wiring – Greasy rub marks along walls – Scratching in walls or ceilings at night – Shredded paper or insulation nests
Found droppings but no mouse?
That’s normal. Mice are nocturnal and stay hidden, so droppings are often the only sign. One fresh dropping site usually means mice are travelling through. Several sites in different rooms usually means an established infestation. Check again in 2 to 3 days after cleaning. If fresh droppings appear, the mice are still there.
When should you call a professional?
Call if droppings keep reappearing after cleanup, if you find them in more than one room, in the attic or in insulation, or if they’re large (rats). Also call if anyone in the home is pregnant, elderly or has a weakened immune system. A technician can find nests and entry points and set up safe, tamper-resistant bait stations.
Elite Pest & Wildlife provides mice and rat control in Hamilton, Stoney Creek, Ancaster, Dundas, Waterdown, Burlington, Oakville and the Niagara Region. Treatment typically costs $279 to $549 plus HST (see prices). Call (289) 799-8718.
FAQ
Is it dangerous to touch mouse droppings?
Touching droppings with bare hands isn’t recommended. They can carry bacteria and, rarely, viruses such as hantavirus. Wear gloves, soak droppings with a bleach solution before wiping, and wash your hands afterward.
Can I vacuum mouse droppings?
No. Vacuuming and sweeping can put particles from dried droppings into the air. Soak them with a bleach solution for about 10 minutes and wipe them up with paper towels.
What does it mean if I find fresh droppings every morning?
Mice are still active and travelling through that spot at night. Place traps or stations along the nearest wall, remove food sources, and look for the entry point. If it continues for more than a week or two, call a professional.
How do I tell old droppings from new ones?
Fresh droppings are dark, shiny and soft. Older droppings turn grey, dry and crumbly. Clean an area completely, then check it again in a few days to confirm whether rodents are still active.