I found that a solid scraper (1 1/2") with a sharp edge worked well when heated with a heat gun. Too much heat would make it gummy and sticky. Too little heat would make it hard to remove. At the right temp, it would shave right off like cheese. Then I would use gasoline (applied with a spray bottle) and a green dishpan scrub pad to remove the residual stuff.
Keep your cigarettes at least 8" away at this point.
Will
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