The sticker is purely optional. I suppose they could put a post-it note up saying "No Squatch"... or they could just do nothing and maybe they'll never get a 'Squatch visit.Lol... can't wait for the responses on the gloss sticker. Your solution for people not wanting other to touch their vehicles is to have them put a sticker on their vehicle? Do they sound like the type that want to adhere a sticker to their vehicle?
There's only so much which can be done in such situations.