I dont allow any bumper stickers on my vehicules, wife has a couple to decals on her rear glass but she knows how i feel on any other part of the car. Im the same way on a dealers decal i bought (the one and only time) a new pickup once and they had put one on it i turned around and went back inside and demanded my check back or they could pay me $100 a month for advertisement or remove it but it wasnt leaving the parking lot with it on, they came out and removed it. and this was back in 79.