Wife seems to enjoy melting her heel on her pipes, and let 'em bake on
real good. :-/ I use a heat gun and a piece of hard plastic; heat up the mark, then use the edge of the plastic to scrape it off. Plastic gets a little soft... just use another edge.
But recently I had a cigar lighter in hand (wonder why) and, being too lazy to get the heat gun hooked up, hit the mark with the flame. Wow, softened it up and I scraped it off with my fingernail! I didn't 'blast' the mark, just waved the flame over it little by little. Yes, I burned my finger, thank you very much.
Shoulda used the plastic. Flames and gas tanks... gotta love it!
Garz