Since soft washings use low pressure and special solutions to clean your roof, they can safely remove mildew, algae, bacteria, or other stains from pretty much any exterior surface. It's great for houses because it doesn't leave behind any residue that could potentially damage the side of the building.
Some of the most common soft-washed surfaces are wood, stucco, stone, brick, vinyl siding, decks, fences, concrete, and shingles. Soft washing can even be used on roofing, fence, and deck surfaces.