The Asphalt Shingle Manufacturer Associate recommends the soft wash method for cleaning roofs. This involves mixing Sodium Hypochlorite (the active ingredient in bleach and pool shock), a surfactant (a specialized soap), and
water. Once mixed to the proper ratios, the chemical should be applied to the roof with a low pressure fan spray pattern. Organics will die and fall of with rain water but the process can be expedited with a rinse with low pressure water after you allow the treatment to work for 10-20 minutes.
Working with these chemicals can be harmful to vegetation and animals if mismanaged. Always consider hiring a licensed and insured professional to complete the work.
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