in 18 years my truck has never had mice other than a tiny problem in the engine compartment. My car did fine for 3 years. Now .... More mice every week. I've tried spring traps with p-nut butter, herbal bags from the ag co-op, sprinkled cayenne around, and poison. The ?*!#&$% mice sometimes outsmart the traps, and once they got away with a close call they stay away from the traps. I tried the sticky traps. They work, but they seem too cruel. i just put out an electric trap. we'll see ....
My better half prefers catch-and-release, but that doesn't seem to work in the car. I kill them reluctantly, but it has to be fast kill. I don't like to see an animal suffer - although I might make an exception for coyotes.
A friend wound up with $4000 damage to his Prius - a scary thought, considering that my mouse-mobile is also a Prius. Here's to hoping that Old Sparky - and maybe some peppermint oil - will settle the matter.