Bought a used strat. The previous owner hadn’t removed the plastic film from the pickguard, so it was really tough to get it off, it was kind of stuck to the pickguard. I managed to get most of it off just by pulling it, but there is still some on there that i can’t get off. Any ideas on any solutions i could put on there to loosen it up or remove it, like rubbing alcohol or something? I don’t want to damage the pickguard (which is red tort).