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Back in the good old days DuPont made something called "Prepsol" used by auto body shops for removing all wax, tar, etc. from panels prior to painting and sold by auto body paint supply stores. I think it was discontinued quite a while ago due to volatile organic compound issues - too bad because it worked really well. Nowadays if I have a lot of tar to remove, I use OOPS or Goof-Off, these smell similar to Prepsol to me and are available in paint stores, hardware stores, Home Depot, Lowes, etc. They are advertised as dried latex paint removers. With a soft cotton cloth, I have found them to both work fine for removing tar from autos without affecting paint.
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