if you cant peel it off, and you dont want to remove the taillight you can do the following:
1)Buy a power inverter that plugs into the cigarette lighter or to the battery to plug in the hairdryer.
or
2) -buy a blow torch and a small cooking pot.
-face the opening of the pot to the taillight without touching it to the actual light.
-blowtorch the bottom of the pot.
-the heat created in the pot will be direct toward the taillight, heating the film.
-once heated enough you can pull it off