I forgot to remove the plastic protective film from the outside of a metal door. The door is white prime/painted. I was able to remove the film from the inside of the door, but the outside is baked on and cracked. I have tried using a metal paint scraper, but the plastic is very resistant to that. I have tried soaking it in water, spraying JigALoo, and now GoofOff.
Should I try ammonia or a citrus cleaner or something else?