Kevin, this question came up about the melted plastic bags, sort of.
It was Neil who suggested using paint remover, which is the best
thing short of benzene, which nobody wants to have, for dissolving
most or all polymers (plastic, vinyl, epoxy, fiberglass, Ceramit…)
The active ingredient in paint removers like Jasco - not some newer,
safer versions - is dichloromethane (old term is methylene
chloride), which, in a word, is Attack. If it doesn’t work then it
doesn’t, but it would be my first choice. Acetone dissolves uncured
resins, but not cured, or very poorly at best.