Melted plastic is not hard to get off, it's the burnt residue, which is probably fused carbon.
Had a blue plastic tarp blow on to my very hot headers. I used a new razor blade and lacquer thinner. I rapped the area with a lacquer thinner saturated cotton rag for about a hour and then just carefully peeled the stuff off with the blade. FYI, for many applications acetone drys too rapidly to work with.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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