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Diesel or kerosene, WD40. Just splash some on an old rag and it'll immediately break down the tar. 3 wipes and done. All the other citrus based crap isn't going to cut it for several minutes. And there is no way I'd use a buffer on tar.
No. 7 (Cyclo) Bug and Tar Remover is good you can find it, much more effective than household strength Goo Gone / Goof Off.