+1 Goo Gone.... Hint, use it outdoors because the vapors are not healthy to breathe.
California bike licenses are the hardest to remove. My 1967 PX-10 came with several of those stickers. The thick aluminum foil protects the adhesive holding it on. It took several hours. Tried everything that wouldn't damage the original paint, even a heat gun. Finally got them off but don't remember what worked best. Now for the Scotch reflective tape on the seat stays.
verktyg