Our roof cleaning process is similar to our house washing process. We use a safe, low pressure cleaning solution to remove black streaks, algae, moss and lichen. When it comes to roof cleaning there is a right way and there is a wrong way. Using high pressure on your roof can result in property damage. Soft washing with a low pressure solution is the only approved method by major shingle manufactures to safely clean your roof without voiding your warranty.
Check out this video by the asphalt roofing manufactures association for more information on roof cleaning.
Cleaning your roof can increase the lifespan as it prevents the growth of moss and lichen which can dig roots into the shingles and cause it to leak prematurely. The black streaks on your roof are a form of algae known as gloeocapsa magma. The algae creates a fertile area for moss to grow.