Soft wash is an environmentally friendly and biodegradable way to clean your roof and most other surfaces. Your roof isn't just dirty or stained ! Thats living organic matter. Bacteria, moss, mold, mildew, lichen, and fungi are the real issue. Using our low pressure non-gas powered skid we address the real root of the problem. When you have a roof pressure washed or just scrubbed with a wire brush, what you are doing is damaging your roofing material, and giving the organic growth a haircut (which is why your roof or siding or deck will need cleaned every year!). Soft wash will give you 100% kill ratio on everything growing up there, if we can safely and non forcefully remove it the day of we will ! Otherwise your roof or other surface will be brighter and cleaner the day of, and all the organic build up will die and weather off naturally over the next 6 to 9 months (depending on severity).