[jeffex11]

I found some 10% HTH pool sodium hypochlorite and it worked well on a garage roof I did several wks ago. It was several patches of mold on a 20 x 40 area of the garage and I was able to hit it lightly with a 40 degree nozzle about 8 to 10 inches off the shingle to rinse. It took one final spray of cleaner and it killed the last of the stain. My rinsing setup would need to be better to do more roofs but this was an add on to cleaning the black stains from the gutters. I haven't committed to being a roof guy just yet although I built a website and b & a postcards to promote it if I get better at it. I guess I need a touch more confidence in NOT F'n up someones roof and loosing my a$$.