The pictures above are after shots on a tile roof that didn’t clean up at all. I used 10% SH diluted down to 5% plus surfactant from a backpack sprayer. I have used this same batch of bleach, before and after this cleaning, and it has worked just fine on heavy moss. This roof was not moss, but an organic growth that was green and red, flat against the tile. When I applied the solution it became very bright red; by the end there was no improvement at all. I then tried a much hotter mix on a small area; still no effect at all. I should add I allowed the initial application to dwell around 10 to 15 minutes before taking the pictures. Any advice would be appreciated.