The black is probably just pollen that had fallen and decayed. That's what makes my driveway black, not algae. I find it easy to clean with an inexpensive pressure washer. I put some Simple Green in my soap tank, spray the driveway and then power wash it off. Takes a few minutes, but I save the money that I would have to pay someone else to do it. Some folks seal their driveway and say it makes it easier to clean.
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