I have found the cheapest and most effective way to remove road tar is to simply use gasoline, soak it well it will not hurt the paint, then wash well with dawn and re-wax if you wish.
If you really want a tough thing to remove drive over a freshly painted white center line when you really don't want to and try getting that off when it has hardened, no fun and almost impossible, still have a bunch in the wheel wells on my TV.
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