Ever wonder what causes those ugly green stains on your deck? How about those black streaks on your roof? If you see green, black or brownish/reddish stains on outdoor surfaces around your home, chances are good that uninvited algae have taken up residence.
on Mar 10, 2013
we used this product on our roof two years ago and it was great. did what it said. Bought some
more this year at costco and plan to retreat. Even worked on our siding.