Quick answer
Mice and rats rely heavily on smell, and strong scents like peppermint, along with the smell of predators and ammonia, are commonly used to deter them. Peppermint is the most practical choice for homes because it's pleasant to people. To work, the scent must be strong, placed on their routes and kept fresh, alongside removing food and sealing gaps.
Because mice and rats navigate largely by smell, it makes sense to ask which smells they dislike. Here's a practical look at the scents people use, which are realistic indoors, and how to use them properly.
Why smell matters to mice and rats
Rodents have a far more sensitive sense of smell than people. They use it to find food, detect predators, recognise safe routes and follow each other's scent trails.
A strong, unfamiliar scent along those routes masks the signals they rely on and makes a space feel less safe, which is why scent deterrents are popular.
What smells do mice hate? The common options
Here are the scents most often used, and how practical they are in a home.
| Smell | How it's used | Practical in the home? |
|---|---|---|
| Peppermint | Oil, balls or sachets on routes | Yes: pleasant to people; choose long-lasting formats |
| Predator smells (cat) | Used litter | Limited: unhygienic indoors |
| Ammonia | Soaked cloths | No: harsh fumes, unsafe indoors |
| Vinegar | Sprayed or soaked cotton | Weak: fades within hours |
| Chilli or cayenne | Sprinkled powder | Limited: irritant, messy |
| Cloves, eucalyptus | Oil or whole spices | Mild; short-lived |
| Moth balls | Scattered | No: harmful chemicals |
Why peppermint is the most popular choice
Peppermint has a strong, sharp scent that rodents find unpleasant, while most people find it fresh and clean. That makes it suitable for kitchens, lofts and cars, unlike ammonia or used cat litter.
The catch is longevity. Peppermint oil on cotton wool can fade within days. MintGuard peppermint balls are designed to release scent slowly for around 30 to 60 days per placement, with no poison and no power needed.
What smell do rats hate?
Rats also rely heavily on smell, and the same strong scents, especially peppermint, are commonly used to deter them from sheds, garages, lofts and under decking. Rats are more cautious and persistent than mice, so scent should always be combined with removing food and blocking access, and a professional for indoor rats.
How to use scent properly
Scent only works if it's strong, in the right place and kept fresh.
- Place it on routes: along walls, behind appliances, near entry points
- Use several placements rather than one big one
- Replace before the scent fades
- Keep it away from food and out of reach of children and pets
- Combine with sealing gaps and storing food
Smells that attract mice (avoid these)
Food smells attract mice: pet food, bird seed, cereal, chocolate, peanut butter and crumbs. Nesting materials like cardboard, paper and fabric scraps also draw them in. Removing these matters as much as adding a deterrent.
Common questions
What smell do mice hate the most?
Strong scents like peppermint are among the most commonly used. Peppermint is the most practical for homes because people find it pleasant.
What smell do rats hate?
Rats also rely on smell, and strong peppermint is widely used to deter them from sheds, garages and lofts.
Does the smell of cats keep mice away?
Predator scent can make mice cautious, but used cat litter isn't hygienic indoors and cats don't stop new mice arriving.
Do mice hate vinegar?
Vinegar has a strong smell but fades within hours, so it's not reliable.
How long does peppermint keep mice away?
Oil on cotton wool fades within days. MintGuard placements last around 30 to 60 days.
Looking for a product? See our mouse repellent page.
Sources and further reading
Written by the MintGuard UK team
Researched from trusted UK sources and checked under our editorial policy. Last reviewed 26 October 2026.
