I, Robert Green, the owner of XLR8 Pressure Washing Services can provide you with some general guidance on this topic being that I have treated a few roofs in this industry. The method preferably used is called Soft Washing. Soft washing is low-pressure cleaning method that uses a solution to remove mold, mildew, and algae from roofs. It's generally considered a safe and effective. This is the ideal way to clean asphalt shingle roofs, which are very common in the US.
Should I allow a pressure washing company to clean my Roof?
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