I have an area on my blacktop driveway that some kids thought needed some spray paint, what is the best way to remove it without damaging the blacktop?
Anything you do to dissolve the paint or with a pressure washer will also remove some asphalt.
I'd vote for a good pressure washer, as tar can be messy stuff since it too will probably dissolve under the action of paint stripper. Rent one if necessary, BEFORE the paint has had time to harden is best.
Once that is done, however, you will still be left with an image of what you stripped off. So I'd next take the opportunity to apply some blacktop sealer to the entire driveway.
Finally, ensure that the kids who did it will not repeat the action. Their paying for the work will help in that respect. If they are required to help do the repair itself, that would be best.
One web site recommends a combination of pressure washer, mineral spirit, and scrubbing with a wire brush.