heat as everyone has mentioned, use a dead credit card to start a corner peel then peel up a bit til it feels hard, lil more heat while holding up on area you just lifted, til soft again, vontinue lifting. Rapid Remover from a sign shop or 3m adhesive remover. Finish off with a good wipe down of rubbing alcohol to base out / neutralize the acid and chems in the adhesive remover.
I lost mine,,,,can you send me yoursuse a dead credit card