Proud Member of the 1K Club
Join Date: Mar 2005
Location: Central Ohio
Re: Cleaning Roof Algae Stains
I cleaned my grandmas roof in Florida awhile back. Dont quote me, but I think we used a mixture of muriatic acid and water. I would verify that before trying it, as it might have been bleach and water. Id feel bad if your shingles started to melt off. LMAO
Either way, I found a common household sprayer, like what youd use for weed control or pesticide, worked great. Pump it up, spray it on, let it set awhile, brush it with a broom, then rinse. I do remember the roof looking great after we were done.