[Mr70]

Do you want to save it?..Depending on how long ago it was put on,I'll bet it's too brittle to come off as one piece.But try soaking it in HOT water overnight,then pick at it's edges with an X-acto knife in the AM.That may soften it up and make it pliable.It might flake off in small pieces and leave the other one underneath alone,but I doubt it.
If that doesn't work at all,try a mild chemical like Goo-Gone..if that doesn't work,step up to a stronger remover like Goof-Off..or OOPs!..but those two will probably smear it & remove the paint like a thinner.