On Tue, 15 Jan 2013 19:15:39 -0800 (PST), Red
wrote:

On Jan 15, 4:12*pm, Dan Espen wrote:
.

I'd use a power washer, no bleach necessary.


I agree. I use one to clean the black crud off my patio, sidewalk,
and driveway. A whole lot cheaper than a couple of gallons of bleach.

Well, In November, I spent six hours and six gallons of gas cleaning
the driveway (and $400 for a pressure washer). A couple of gallons of
bleach is cheap! Though I used that too. Didn't work.