What Home Remedies Actually Work Against Mice?

Exclusion — packing ¼-inch-plus gaps with steel or copper wool and caulk, screening vents, and sealing utility penetrations — is repeatedly identified as the single most effective and permanent measure, because it stops reinvasion rather than just reducing numbers temporarily. Snap traps set along walls where mice travel remove the mice already inside. Sanitation (sealed food containers, no pet food left out overnight) lowers how many mice a home can support, though it won't eliminate an established population on its own. These three, done together, are the actual protocol.

Peppermint and other essential oils fade within days and mice adapt to them if food and shelter remain. Ammonia mimics predator urine but the effect is brief, and effective concentrations are hazardous to sustain indoors. Ultrasonic and electromagnetic devices have drawn direct FTC scrutiny for unsupported effectiveness claims and are quickly ignored by rats and mice alike. Cats and dogs are genuine but situational supplements — see their dedicated pages — not solutions on their own.

Mothballs deserve a separate, stronger warning. Naphthalene is not EPA-labeled or intended as a rodent repellent, and using mothballs against mice is a genuine safety hazard — not just a weak remedy. They release toxic vapors indoors and pose a real poisoning risk to children and pets. Never use mothballs against rodents; if ingestion is suspected, contact the Northern New England Poison Center at 1-800-222-1222.

Trap aggressively at wall-hugging travel routes, remove accessible food and water, and seal every ¼-inch-plus gap at the same time. If mouse activity persists past a few weeks of consistent effort, or you're dealing with wall/attic nesting, it's time to call a professional. Anchor Pest Services builds full exclusion-and-trapping programs for NH homes.