I see the applicator and the post cleaning protection product, in your photo, but where is the QSE Roof Cleaner product? This is a pink powder that you dissolve in water then apply. I’ve always had good results with the QSE Roof Cleaner. I spray it on out of an electric pump sprayer. This takes the guess work out of mixing. The process is; spray on, sit for 20 minutes, rinse off. The same company sells another product called Roof-OX Roof Cleaner and this stuff is garbage. The QSE has always had good results.
I did get 4 packs of the QSE. Used 2 of them on my roof and brick chimney. Sprayed the the roof and let it dwell for 30 minutes, it was a cloudy day so evaporation was slow, then rinsed off.
Did it again later that evening and left it on the roof to dry.
After several rains it should have at least lighten the stains but didn’t. I gave it plenty of time to work. My stains are from trees all around my home front and back.
