Well, I don't know the best way. I have removed that stuff a couple of times. They only wat to effectively remove it is with soapy water and a razor blade. Score the plastic with the razor, spray on the soapy water, let it set, and scrape the stuff off. I have thought about trying a heat gun, but never did. The glue on the mylar is water activated plus the mylar is designed to set in the sun for hours on end. So I don't know if heat applied from the insede would do any good. I hope this helps, Jimmie.
