Algae causes the black streaks.

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We find that the black roof streaks are being caused by a form of algae that feeds on the limestone in the roof shingles.

The best solution is ROOF QSE, and a professional roof cleaner.

A roof cleaner will assess the situation and safely clean the stained roof.

Roof QSE is only available on line from CleanerTODAY. The web site is
www.cleanerTODAY.com