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Document 1 from Alpha Systems illustrates how to clean a Alpha TPO roof membrane. Document 2 illustrates how to remove the stubborn black algae from the Alpha membrane that may form on the exterior and on the area of the roof trusses.
For the Algae removal I used a gel bleach on the area of the trusses where the black algae was forming. Brushing on the gel bleach will assure there is good control and there is not too much being applied. The brass brush that I purchased on Amazon was very soft. The reason for this is that the solid and very light brass fibers are so thin, they can get into the textured TPO membrane and as a result is very effective at cleaning out the algae.
https://www.amazon.com/Osborn-54036-...sr=1-1-catcorr
For the Algae removal I used a gel bleach on the area of the trusses where the black algae was forming. Brushing on the gel bleach will assure there is good control and there is not too much being applied. The brass brush that I purchased on Amazon was very soft. The reason for this is that the solid and very light brass fibers are so thin, they can get into the textured TPO membrane and as a result is very effective at cleaning out the algae.
https://www.amazon.com/Osborn-54036-...sr=1-1-catcorr