I used to have remove fried mommas & babies from the top of my air filter housing in my 81' Blazer. Poor things, some days I did a couple hundred miles before I realized it.
I had one that was peeing on the computer in my wife's van. I got it fixed for about $400. Next week the same thing and another $400 this time the mechanic stuffed some chicken wire in there. That ended the problem. At that time, my wife was working nights. She often snacked to and from work. Crumbs attracted the mice. Can't use poison because we have pets., also I don't want to poison other animal, birds etc that might eat the poisoned mice.