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My wife really likes the pull twist and yank method. Then we get to spackle and paint. She used hot glue to stabilize her pictures on the wall of a rental. She's not gonna do it on the new home we just bought thoough.
I believe hot melt glue is basically polyethylene (same stuff as in plastic grocery sacks). I don't know of any solvent that dissolves it (at least none that won't damage the surface too).
If it's a smooth surface (painted wall, furniture, etc) I'd try to shave it close with a razor blade & then try to rub off what remains.
If it's on fabric or carpet, I'd try to carefully pick off the worst of it, then iron it with a few sheets of thick paper or boxboard (cereal box with the gray side to the hot melt). NOTE: I HAVEN"T TRIED THIS - I'm JUST FLOATING SOME IDEAS!! You may want to experiment a bit on something else. The iron may just spread the glue around, but if you can find something that the glue will stick to tighter than what it's stuck to now, you may be able to pull it off in a tug-of-war.
Acetone. You can buy the good stuff from any chemical distributor. For household uses steal honey's fingernail polish remover. The vaste majority of them are acetone and skin lotions. Acetone will dissolve anything plasitic. Use it all the tiem at work.
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