RE: Cleaning the Tar off
I have tried a bunch of "bug and tar remover" products but they all require you to re-wax because they also strips the wax. I finally tried using a "cleaner wax" and later the yellow wax and sealer wax (synthetic) (mostly Meguire's products but other good brands should also work) on those stubborn tar stains. Any one of these will work, for me it just depends on what state of "clean" the rest of the car is in as to what I will use.
Dab a bit (drop or so as needed) of the liquid paste wax of choice on the tar with your finger and let it set for a few minutes (but do not let it dry), then work it with your finger tip or finger nail for really stubborn spots. With the still moist wax as a solvent and lubricant, your fingernail should not scratch your paint.
It softens the tar then wipe off the "heavy dirt" lightly with a rag and then buff with a clean rag.
Best part is no need to re-wax!