What are these roof stains?
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Saprophytic fungus arrives and collects on roofs and other exterior surfaces via airborne spores. Once attached to a shingled roof, this fungus begins to feed on the dead organic matter such as asphalt used in the manufacturing process. As the fungus begins to break down the asphalt, the ceramic granules are loosened and begin to fall off. The ceramic granules are layered on top of the roofing material in the manufacturing process to protect the roofing material from UV degradation, and once removed, the roof will begin to deteriorate prematurely.
 
Scotti Bros. introduce this revolutionary new product called Renew TM Advanced Roof and Deck Cleaning Formula. Renew TM has been specially formulated to clean asphalt, cedar, and fiberglass shingles. Renew TM also works great on decks, wood fencing, and docks. Renew TM is 100% biodegradable and contains no bleach, solvents, acids, phosphates or peroxide. Renew TM is designed to be rinsed with low pressure and does not leave streaks.

Renew TM is highly concentrated and has a large amount of chelating agents to prevent scaling of hot water pressure washers and heating devices. Renew TM has special ingredients along with an added level of surfactants to aid it in clinging to steep pitched roofs and vertical surfaces such as deck railings during the dwell cycle. Other products run off too quick and do not achieve proper dwell.

Renew TM is a dual acting chemical which acts as a sealer to prevent the re-development of the fungus for several weeks after application.