With over 10 years in the pressure and soft cleaning I have started with roofs just under a year ago. I only have a handful under my belt but the all look great so far. My question is: has anyone experienced the browning of the blue green algae (when itís heavy) not coming off after 2-3 rain falls? I have a picture attached of a section of my most recent job. Itís not the best picture with the evening light but itís all I got.IMG_4258.jpg

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