[Licensed to kill]

I use a rust inhibitor (anti-freeze) year round and for winter storage, park it in a heated garage and disconnect the battery. As for mice, I have a few traps around the garage but the best protection IMO, would be a 5 gallon pail on the floor with a small board going from the seat to the edge of the pail. String a soda can across the top of the pail with peanut butter on it. They will climb the board and jump to the can to get the PB and fall into the pail. You can put a couple inches of water in the pail to dispatch them relatively quickly but even dry, they will only last a day or so. Easier to dispose of the carcasses if the pail is dry but, either way you will want to check the pail at least weekly. They can get pretty ripe with or without the water if left too long and you don't want THAT smell in your car.