The peppermint works, but you need to get "Essential oil of Peppermint" not common peppermint oil. This can be found at health and holistic stores. Put 4-5 drops on a few cotton balls in an old glass or coffee mug. Do not get it on anything it will damage paint and plastic. Replenish when the scent gets weak. I have used in my RVs for years and no mice or spiders despite mice in the garage right next to it.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels