Not to disagree with Ken but, Asphault can be cleaned but you need to be real careful. The substance varies a lot. I have cleaned paint off asphault with hot water and a turbo nozzle. I have also tried to clean it with a 40 fan nozzle and damaged it.
Doug
Still, I think it's best I stay away from it at least until I get some experience. It's such a small area around here, screw something up and within a week, the whole county will know.
Thanks for the advice!