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.
Filled my air wick with essential Peppermint oil and water. Chose this scent for 2 reasons 1. I woke up to a huge throbbing spider bite on my cheek this morning and found out peppermint oil repels spiders. 2. Dug a little deeper and peppermint oil also repels other insects, Mosquitos and mice. Score. Let's see if this actually works. Do It Yourself ~ Airwick Plugin Refill