- 1). Mix the hydrogen peroxide based roof cleaner with warm water and let activate for 15-20 minutes, stirring occasionally.
- 2). Transfer mixture into the "garden style" pump sprayer, be careful not to transfer any undiluted powder particles that may clog the spray nozzle.
- 3
Hydrogen peroxide attacking the roof moss.
Spray small 10'x10' areas of the roof that are affect with moss at a time so that they may be cleaned before the product dries. Note: follow this method if you are using a deck brush and hose to remove the moss, if you are going to be using a pressure washer you may coat the whole roof and it is ok if the product dries. - 4). Scrub with a medium/hard bristle deck brush in a circular motion and rinse area completely with a garden hose or substitute the pressure washer for the brush and hose.
Source...