Can you put a wall sticker on a car?

yea and depending on the ones that are put on there it may be better way of doing us talk to a auto place find out if they have some type of cleaner to use to take deccals off your car seems their should be a good reason for that to come off i would see a auto center they could tell you how to take them off sometimes if you use water till the decals are real wet then you may let them clean it off for you or you might be able to take care of it by soaking it in water