If the paint is still wet, I use a damp/wet toothpick (natural wood--the colored toothpicks leave their color) and gently sweep and push the paint toward the frame. WIPE THE TOOTHPICK on a paper towel AFTER EACH SWIPE THROUGH THE PAINT! The wood toothpick will USUALLY give way and bend or break before the clear part does. I have had this work exceptionally well for acylic paints that had been overlooked when the paint was wet and dried on the canopy. It left very little, if any residue at all. As far as dried enamel paint, you might try the damp/wet toothpick to remove the residue. Like I said, I've had it work, but it just depends on how thick the paint is on the plastic. This technique just might get the residue off, that was left by the plastic "chisel". Let me know if it works.