 NHOU Mouse Out is infused with peppermint oil and predator scent that's undetectable by humans. It helps deter rodents in several ways. Scent, taste, touch, and predatory fear. Of course, an ancillary benefit of using Mouse Out is protecting the surface from corrosion. With increased electronics and wiring on today's vehicles, it doesn't take much for an animal to disable the vehicle with wiring harnesses and other related damage.