Tony Latonis Report post Posted February 21, 2018 I'd like to make or buy a solution to clean run-off stains on a church in AZ. Pretty sure it's not algae cause it's, you know, Arizona? Share this post Link to post Share on other sites
Curb Appeal Pros LLC Report post Posted February 22, 2018 You're going to have to do some test spotting with different chemicals. That looks like runoff from the flashing on the 2nd pic. Which means you're probably looking at something that is not biological. On the first picture, I would try SH first as it looks like a shaded side that very well could have growth. But, for the most part, when we bid things like that, we take an arsenal of chemicals to test in small spots. F9 Barc and Efflo, One Restore, etc. Just our $.02. 1 Apple Roof Cleaning (813) 655-8777 reacted to this Share this post Link to post Share on other sites
Kenneth Report post Posted October 14, 2018 Hi, In my opinion, it is better to take advice from a professional cleaner. Thanks Share this post Link to post Share on other sites