Paper stickers come off fairly easy with peanut butter. Put a fair amount on the sticker and let sit overnight. Then wipe it off, the peanut butter will remove most of the sticker the first time, usually comes off easy after sitting overnight.

You can do it a second time with less if it doesnt come all come off. Never had damage to the paint underneath the few times I have done that.

Not sure it will work with metallic type stickers? Only removed paper ones with this method.