Never let anyone talk you into pressure washing your roof. Using high pressure water to clean roof stains might do more damage than good. Power washing a roof may create a perception of clean, but it’s near impossible to see on a microscopic level if the roof is completely sterilized. If any spores are left behind the stain will reappear quickly, usually within a year or two. With our complete sterilization process we can be assured that we achieved a near 100% kill ratio on the mold, mildew, algae and moss that are eating away at the roofing shingle. Our process will allow the roof to stay cleaner for a longer period of time.