Combine two teaspoons of peppermint oil with one cup of water and then add a few drops of dish detergent to help the ingredients mix better. Shake it all together in a spray bottle and apply the mixture any place that you have or suspect you have mice. Reapply the spray as the scent fades, usually after about two weeks. Also you can put undiluted peppermint oil on a cotton ball and place where you suspect mice.
DIY Combination Deodorizing Disks AND Mouse Repellent
Peppermint oil for getting rid of mice. Now that cold weather is coming, rodents are looking for a nice warm home. Here's how to keep them from invading yours, with natural essential oils. Mice and other pests absolutely hate the smell of peppermint.