ROOF CLEANING The Problem The black discoloration on your roof isn't actually dirt at all.  Your roof is discolored and streaked because algae is growing on it.  Stains on roofs are forms of algae, mold, and mildew, which are blown onto the surface of the roof and become established over a short period of time due to warm humid conditions, moisture and decreased sunlight in the areas which they begin. This organism penetrates the shingle by forming roots that bury themselves into the limestone filler that serves as the base for the asphalt shingles. Over a period of time these roots will loosen and eventually separate the granules, which protect and are the main part of the shingle itself, from the limestone and asphalt base causing premature shingle failure. The Solution The only safe way to remove roof borne algae is through chemical application and high volume no pressure  rinse. High pressure cleaning and stiff brush scrubbing will all lead to granule loss and premature roof failure and provide only a temporary solution to an ongoing problem. The Benefits Adds value to your home Provides healthier living area Prevents premature roof replacement Aids in sell or marketing of real estate Before This is the cleaning solution in ACTION! Ten minutes later streaks have disappeared without ANY pressure! Note: Solution beginning to work on smaller section to demonstrate the difference. After a thorough NO PRESSURE rinse and roof has dried it looks new again!