Composition roofs are quickly becoming a popular choice because their shingles come in a variety of styles and colors. Like other roofing materials, composition shingles are not immune to the elements and organic growth. Moss and algae, in particular, tend to be the number one threats to shortening the lifespan on a composition roof. These organic materials can quickly strip away the top granulated layer of the shingles, causing an early roof failure. Since pressure washing a composition roof can easily damage the shingles, Coast Roof Cleaners will not use a pressure washer, or any pressure greater than that of a garden hose to clean your roof. Our specially formulated cleaner easily removes the moss and algae, and is safe to use around people, pets, and the environment.