Roof Cleaner Qse 1500

Enough to clean 1 500 square feet 15 squares in roofer speak just add 2 gallons of water apply to the roof for 25 minutes then rinse with a soft wash not over 500psi water rinse. Enough roof cleaner to treat 1500 sq ft of shingle roof. I have a picture attached which shows before on the right and after to the left.

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