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Add lacquer thinner, slosh around a bit, then dump it (that is properly dispose it). May take a couple of washes, but that is about the best solvent for that purpose.
Firecracker .
I wouldn't go with MEK, that stuff is NASTY (as in will f you up).
Put in 4-6 oz. of acetone, shake and swirl, then drain. Repeat.
Acetone can be found at any paint or hardware store.
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MEK (methyl ethyl ketone) oughtta do it, but watch out, it eats paint, and use it outdoors.