How to Get Rid of Mice: The Complete Guide That Works

Quick answer: To get rid of mice, seal every gap wider than about 1/4 inch with copper mesh and caulk, remove open food and nesting spots, then set plenty of snap or electronic traps along walls where you see droppings. Check traps daily and keep trapping until you go a full week with no catches and no fresh droppings.

If you’re wondering how to get rid of mice without making the problem worse, the good news is that the method is simple and it works: block the way in, take away the food, and trap the mice that are already inside. The bad news is that skipping any one of those three steps is why most infestations drag on for months.

This guide walks you through the whole process, from reading the signs to cleaning up droppings safely the way the CDC recommends. It’s also the hub for everything pest-related on Get Rid Guides, so you’ll find links to our trap buying guides, garage and car engine guides, and our guides to bed bugs, fleas and fruit flies.

Signs you have mice (and not rats)

Mice are nocturnal and shy, so most people notice the evidence before they ever see an animal. Here’s what to look for:

• Droppings: small, dark, rice-shaped pellets about 1/8 to 1/4 inch long with pointed ends, usually in drawers, under sinks, behind appliances and along baseboards.
• Gnaw marks: tiny, paired scrape marks on food packaging, wood, plastic and wiring.
• Noises at night: scratching or skittering in walls, ceilings or cabinets, especially after the house goes quiet.
• Nests: balls of shredded paper, insulation, fabric or dryer lint tucked into quiet, warm spots.
• Grease marks and a musky smell: dark smudges along walls where mice run the same route every night, and an ammonia-like odor in closed spaces.

Rat droppings are much bigger, roughly 1/2 to 3/4 inch long and blunt at the ends. Rats also leave bigger gnaw holes and need larger, sturdier traps. If what you’re seeing sounds like rats, read our guide to the best electric rat trap, because mouse-size traps often fail on adult rats.

Why mice get into your house

Mice come inside for three things: food, water and shelter. Activity usually jumps in fall when temperatures drop, but a house with easy food can have mice all year.

A house mouse can squeeze through a gap about the size of a dime, roughly 1/4 inch. Common entry points include gaps around plumbing and gas lines, dryer vents, garage door corners, foundation cracks, utility penetrations, weep holes and gaps under exterior doors.

Once inside, they multiply fast. According to university extension experts, a female house mouse can have a new litter every few weeks, with around five or six pups each time, and those pups can breed within about two months. That’s why “I only saw one mouse” rarely means there’s only one.

How to get rid of mice: step by step

Follow these steps in order. Trapping without sealing means new mice replace the ones you catch. Sealing without trapping traps the mice inside with you.

1. Find where they’re active. Look for fresh droppings, gnaw marks and grease trails. Mice usually stay within about 10 to 30 feet of their nest, so clusters of droppings tell you where to focus. Fresh droppings are dark and soft; old ones are dry and crumbly.
2. Inspect the outside of your home. Walk the foundation with a flashlight. Check where pipes, cables and vents enter the house, the bottom corners of garage doors, gaps under doors and cracks in siding or brick. Anything you can slide a pencil into is big enough for a mouse.
3. Seal gaps with the right materials. Stuff small holes tightly with copper mesh or steel wool, then cover with caulk or sealant so it stays put. Use 1/4-inch hardware cloth over vents and larger openings. Add door sweeps and replace worn garage door seals. Foam alone is not enough; mice chew right through it.
4. Remove food, water and nesting spots. Move pantry staples, pet food and birdseed into hard plastic, glass or metal containers with tight lids. Wipe crumbs, pick up pet bowls at night, fix dripping faucets and clear cardboard clutter from basements and closets.
5. Set more traps than you think you need. For a typical kitchen, start with six to twelve traps. Place them along walls and behind appliances, perpendicular to the wall with the trigger end facing it, because mice run along edges. Extension experts suggest spacing them a few feet apart where activity is heavy.
6. Bait with a small amount. A pea-size dab of peanut butter, hazelnut spread or a little oatmeal pressed onto the trigger works well. In cold months, a tuft of cotton or dental floss wrapped around the trigger can beat food, because mice collect nesting material.
7. Check traps every day. Remove catches promptly, re-bait and move traps that haven’t caught anything after two or three nights to a new active spot.
8. Clean up droppings and nests safely. Once activity stops, clean using the CDC method below. Never sweep or vacuum droppings.
9. Confirm they’re gone. Keep a few traps set and check for fresh droppings for at least one to two weeks after your last catch. No catches plus no new droppings means you’ve won.

Place snap and electronic traps where children and pets can’t reach them: behind appliances, inside cabinets with child locks, or inside a covered trap station. Wear disposable gloves when handling traps and dead mice, bag the mouse and trap together if you’re disposing of both, and wash your hands with soap and water afterward. Never leave loose rodenticide bait anywhere a child, dog or cat could find it.

Which mouse traps work best?

Most homeowners get the best results with a combination of trap types. Here’s how the main options stack up:

Trap type	Best for	Pros	Watch out for
Wooden snap traps	Big infestations, budget	Proven, cheap per trap, reliable	Can snap fingers; not reusable once soiled
Easy-set plastic snap traps	Beginners, squeamish owners	Simple to set, no-touch release	A bit bulkier to hide
Electronic traps	Kitchens, no-see disposal	Enclosed kill, catch indicator	Need batteries; owner ratings mixed
Glue boards	Not recommended	Low cost	Inhumane; the CDC advises against them because frightened mice urinate
Live-catch traps	Very light activity	No kill	Must release far away (check local rules); handling stressed mice raises exposure risk

For a detailed breakdown with every pick we recommend, see our guide to the best mouse trap. If you prefer an enclosed trap, we also explain what to expect from electronic models in our Victor electronic rat trap review.

Should you use mouse poison?

In most homes, no. Rodenticides kill slowly, so a poisoned mouse often crawls into a wall, ceiling or under a floor and dies there. That leaves you with a lingering odor, flies and no way to confirm the problem is solved.

Poison is also a real risk to kids, pets and wildlife. Dogs are especially likely to eat bait, and owls, hawks and cats can be poisoned by eating a poisoned mouse. EPA rules limit consumer rodenticide products to tamper-resistant bait stations for this reason.

If you use rodenticide at all, keep it outdoors or in areas children and pets can’t access, use only a tamper-resistant bait station, and follow the label exactly. Never place loose pellets or blocks. Keep the product in its original container and have the label handy. If a child or pet may have eaten bait, call Poison Control (1-800-222-1222) or your vet right away.

Do ultrasonic repellers or peppermint oil work?

Plug-in ultrasonic repellers are one of the most popular mouse products online, and one of the least effective. Research over the years has shown little to no lasting effect: mice may avoid the sound briefly, then get used to it. Ultrasound also doesn’t travel through walls, furniture or cabinets, which is exactly where mice hide.

Peppermint oil, dryer sheets and mothballs fall in the same category. Peppermint may deter mice for a short time in a tight space, but the scent fades quickly and it won’t clear an established population. Mothballs are a pesticide meant for sealed containers, and using them in open living spaces isn’t safe or legal under the label.

Our honest advice: skip repellents as your main plan. Put that money into traps and sealing materials.

How to clean up mouse droppings safely (CDC method)

Mouse droppings, urine and nesting material can carry germs. Deer mice and some other wild rodents can carry hantavirus, which spreads mostly when people breathe in dust from contaminated droppings. House mice can spread other bacteria, such as Salmonella. The CDC’s cleanup method is designed to keep particles out of the air.

1. Air out the space. Open doors and windows and leave the area for at least 30 minutes before you start.
2. Put on gloves. Wear rubber, latex, vinyl or nitrile gloves.
3. Wet everything first. Spray droppings, urine spots and nests with a household disinfectant or a fresh bleach solution of 1 part bleach to 10 parts water. Let it soak for about 5 minutes.
4. Wipe, don’t sweep. Pick up the wet material with paper towels and throw it in the trash in a sealed bag. Never sweep or vacuum droppings, because that stirs contaminated dust into the air.
5. Disinfect the area. Mop or sponge floors and countertops with disinfectant or bleach solution, and steam-clean or shampoo soiled rugs and upholstery.
6. Clean up yourself. Disinfect your gloves before removing them, then wash your hands thoroughly with soap and warm water.

Never mix bleach with ammonia, vinegar or other acidic cleaners; the fumes are toxic. Mix bleach solution fresh, use it in a ventilated space, and keep kids and pets out of the area until surfaces are dry. For heavy contamination in closed spaces like sheds, cabins or crawl spaces, consider a respirator or a professional cleanup service.

Mice in the garage, car or other trouble spots

Mice rarely stay in one room, and some spots need their own approach.

Mice in the garage

Garages are the number one staging area for mice heading into your home. They’re full of birdseed, grass seed, pet food, cardboard boxes and warm corners, and garage doors often leave gaps at the corners. Our step-by-step guide on how to get rid of mice in the garage covers door seals, storage bins and where to place traps in a garage.

Mice in your car engine

Parked cars offer a warm, sheltered engine bay, and mice love to nest in air filter boxes and cabin air intakes. They can chew wiring and insulation, leading to costly repairs. Learn how to check for damage and keep them out in our guide on how to get rid of mice in a car engine.

Mice in walls and attics

Scratching in walls usually means mice are traveling between floors along pipes and wiring. Trap at the points where those runs open into rooms, such as under sinks and behind the stove, and seal the openings once catches stop. Heavy activity in walls or attic insulation is a job for a pro, as explained below.

When it’s actually rats

Rats need stronger, larger traps and more caution. Electronic rat traps give you an enclosed, no-see kill that many owners prefer. Compare the options in our best electric rat trap guide, or read our in-depth Victor electronic rat trap review.

The tools that solve most mouse problems

You don’t need a garage full of gadgets. These four products cover almost every home mouse problem. For more options, see our full best mouse trap guide.

Electronic traps deliver a high-voltage shock. Always switch them off before opening, keep them away from water and out of reach of children and pets, and follow the manufacturer’s battery instructions.

Mouse prevention checklist

Once your house is clear, a few habits keep it that way. Run through this list each fall, when mice start looking for winter shelter:

• Walk the foundation and seal any new gaps with copper mesh and caulk.
• Check door sweeps and garage door bottom seals for wear and daylight at the corners.
• Store pet food, birdseed and grass seed in metal or heavy plastic bins with locking lids.
• Keep firewood at least 20 feet from the house and off the ground.
• Trim shrubs and tree limbs so they don’t touch the siding or roof.
• Use trash cans with tight lids and take garbage out regularly.
• Cut clutter: swap cardboard boxes for lidded plastic bins in the basement, attic and garage.
• Keep a couple of traps set in the garage and basement year-round as an early warning.

Other household pests: where to go next

This guide is the center of our pest section. If mice aren’t your only uninvited guests, these guides go deep on the next most common problems.

Bed bugs

Bed bugs are a very different fight: they hide in mattress seams and furniture, and steam, laundering on high heat and encasements matter more than traps. Start with our guide on how to get rid of bed bugs yourself, then compare gear in our guides to the best steam cleaner for bed bugs and the best mattress encasement for bed bugs.

Fleas

Fleas usually arrive on pets and then lay eggs in carpets and bedding. Treating your pets with a vet-recommended product is step one, and daily vacuuming does much of the rest. See how to break the life cycle in our guide on how to get rid of fleas in the house, plus our picks for the best vacuum for fleas and pet hair.

Fruit flies

Fruit flies breed in ripe produce, drains and trash cans, and a simple vinegar trap goes a long way. Our guide on how to get rid of fruit flies covers DIY traps and when a plug-in trap is worth it.

When to call a professional

Call a licensed pest control professional if you hear or find heavy activity inside walls, ceilings or the attic; if you’ve trapped for three to four weeks and still find fresh droppings; if you find droppings in HVAC ducts or insulation; if you’re dealing with rats as well as mice; or if anyone in your home has health symptoms you think could be connected to rodents (see a doctor, too). A pro can find entry points you can’t reach, like roof lines and soffits, and handle bait stations safely.

Frequently asked questions

How long does it take to get rid of mice?

A small problem with one or two mice is often solved in a week or two of steady trapping. A larger infestation can take three to four weeks or more. The key is sealing entry points at the same time, so new mice don’t keep replacing the ones you catch. Keep checking for fresh droppings for two weeks after your last catch.

What is the best bait for mouse traps?

A pea-size amount of peanut butter or hazelnut spread is hard to beat, because mice must work at it and trigger the trap. Oatmeal, bits of bacon or chocolate also work. In cold weather, try cotton balls or dental floss, since mice are gathering nesting material. Too much bait lets mice lick it off without setting off the trap.

Will mice leave on their own?

Rarely. If your home gives them food, water and shelter, they have every reason to stay and breed. Mice may move to another part of the house, but they won’t leave for good until you seal entry points, remove food sources and trap the mice already inside.

Is it safe to vacuum mouse droppings?

No. The CDC advises against sweeping or vacuuming mouse droppings because it can put contaminated dust into the air you breathe. Instead, air out the space, put on gloves, spray droppings with disinfectant or a 1:10 bleach solution, let them soak for about 5 minutes, then wipe them up with paper towels.

Why am I not catching any mice?

Common reasons are traps placed in the open instead of against walls, too much bait, too few traps or human scent on new traps. Put traps where you see fresh droppings, set them perpendicular to the wall, use a small dab of bait and add more traps. Leaving unset, baited traps out for a night or two can also help mice get used to them.

Does one mouse mean an infestation?

Not always, but it’s a strong warning sign. Mice breed quickly, and where there’s one there are often more. Look for droppings in several rooms, set a handful of traps and check for entry gaps now. Catching the problem early is far easier than dealing with dozens of mice later.

The bottom line

Seal, clean up food and trap aggressively, and most mouse problems end within a few weeks. Ready to pick your traps? Start with our guide to the best mouse trap to find the right type for your home.