I have not used it. I just inquired about it. I am copying and pasting what the rep said. I dont think he knows anything about roof washing but its a start.
For ClearWash HS dosing, start at 0.5-1% of ClearWash HS in a 1% bleach solution. For steeper roofs or more foam use more concentrate. The dirtier the roof, the more bleach should be used.