You think they would work to keep mice and rats away? I get the in parked vehicles.
Mr. Claret puts Irish Spring soap bars in his deer camp mobile home, deer blinds, and storage shed. It is very effective in keeping the critters out.
My father put mothballs in his classic convertible to keep the mice out over the winter. It was largely fine under the hood but he ended up replacing the carpet and trunk liner because of the odor. He also swapped the self-storage unit for a garage which doesn’t appear to have mice.