I read that peppermint oil keeps mice away better than dryer sheets.
And my car smells minty-fresh in spring.
+1 on park brake off and oil change before and after storage, with the cheapest possible essence of dinosaur, no need for synthetics.
I started my E30 twice last winter because I couldn't help myself. Rolling it from one end of the garage to the other just wasn't doing for me. I know, I'm bad, but if you let it run until it's warm enough to evaporate the water out of the oil it's less bad.