If you have CertainTeed roof that is less than 10 years old, the cleaning may be covered for free, we just had this done, you can call 1-800-345-1145 to see if your roof qualifies. This cleaning gets rid of the algae staining that looks like dark or black streaks on the roof. Also, this cleaning has a 5 year warranty against the return of the algae. Cleaning took about 1.5 hours for 3200 square foot roof.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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