Joined: Tue Mar 18, 2003 3:45 pm Posts: 2884 Location: San Antonio,TEXAS
It started out as green mold that eventually died and turned black.
Assuming you want to get rid of it, typically people use products with oxalic acid in them. You can spray it on and it rinses clean. I've used TSP with a little chlorine bleach and a lot of elbow grease. I'm not sure there is a perfectly organic way to clean them.
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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