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They make decal remover stuff. I can't think of what its called though. Have you been to Autopia? They might be able to help you. There are a few of the guys on that board that work for dealerships and I'm sure they have to remove them off trade ins and stuff.
Don't really trust those liquid sticker removers. I keep thinking that it'll take the paint off as well. But for others that have a badge instead of a sticker, dental floss does wonders in removing the dealer badge.