I park "the fleet" near the fence line of my property, and next door is about 13 acres of nothing but brush and trees.
Even with the cat leaving dead rats on the front porch almost every other night the little field mice get in the cars from time to time.
Last spring I put those little poison filled D-Con boxes under the seats. Started finding little green mouse droppings in the cars so I knew their days were numbered.
Well, one crawled up somewhere in the white wagon and died. Geez Louise it was almost 3 months before I could drive that car again. Literally!!
A year later I still haven't found the corpse. Have had dash and seats out a couple times......