HD, Ditch the solvents, the pre-packaged pancake batter, 30% breast milk, etc. at the car store. Rather, go to Walmart or Walgreens and buy a bottle of 91% Isopropyl Alcohol. Find the nastiest, oldest, crusty bit of ambered tree sap and with a small, well-wetted rag rub like you are polishing an old coin. It's magic.
The trick, however, is that you have diluted the pitch or tar to its smallest parts, so you've ended up with a percentage spread on the surface. Throw that first rag (good reason to keep them very small) away and finish off with a new one. ...'functional magic.
Jim
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