What type a solvent would be good for dissolving tar?
Kerosene or diesel are the safest, but extremely slow (need constant agitation to be of any practical use). Gasoline works fast, but is extremely volatile (bad for you, too) - don't use it.
Mineral spirits are the best comprimise, doing a very good job dissolving the tar, but still flammable so you need to be careful when using it (outside, away from your house, et cetera.) Put it in a sturdy container with a lid (allow for pressure to escape) and let it hang out for awhile (check it after a few days).
You'll want to get a pair of "chemical" gloves, the thick ones that go up your arm, and a long apron. You will also want a work surface covered with cardboard and newspapers; you will still get the stuff all over the place.
Jon
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