Here's what I do with mine.
1~wash and wax( cover with car cover) something breathable
2~vacuum interior, 2 bounce sheets, 1 small bag of charcoal opened down the center & placed on a garbage bag in the back seat
3~pump up tires to 40 PSI and place rubber matts under all 4
4~ full tank of fuel and all fluids topped up (if needed)
5~ battery tender
6~ Several mouse traps around the perimeter of the car, baited with peanut butter and bird seed ( always seem to catch at least one)
What's your tricks to keeping your ride, mouse free and fresh for the spring ?
forgot to mention , only use plain charcoal briquettes, the ones that are "self starting " are impregnated with starter fluid and stink up the inside of your car !