This is actually not a dumb question. And slugs/snails getting on your car is not out of the realm of possibilities. Not sure about the op. I finished a roof later tonight and ended up loading the truck after dark. I needed a bigger ladder than I had at home so I strapped a 40 footer to the roof of my Subaru outback. It was laying in the grass behind the guys house since yesterday. Well when I got home and sitting here smoking a cig before I go inside. I noticed something on the windshield moving really slow. “Wtf is that”. Grabbed a flashlight and realized it’s a baby slugs. I walked around the car and stopped counting at 130. As I’m finishing my cigarette I do start thinking about how different stuff like bat poop or something stupid like water and sunlight destroys paint. The very question in the op eventually came to kind and here I am reading everything I can find on the subject.htf did snails get on the painted parts of your car?