What do I use to get old brittle stickers off my boat. I have to put the new registration stickers on but the old ones are not coming off. I took a razor blade to it and about 15min later I got one of the stickers off but not without gouging in the paint. It is an alum boat please tell me there is some magic chemical that will eat these stickers maybe a torch that might work:devil: really I wonder if I could do it carefully enough....