Oh I love mice in vehicles.....

My 1970 was pretty good for getting mice in it. Tried moth balls, all that did was stink up my truck. Tried mouse poison, they ate it and somehow kept coming back. Tried putting dryer sheets and soap and everything that smelled strong, they still came back and just chewed up all the stuff I left for them.
The biggest help in keeping them out was leaving the door open on the shed that the truck was parked in, so the cats could get in. Also, not leaving any grain or other food in the same building as your parking vehicles.