My wife and I used this company last week after seeing their coupon on Topix. We are both impressed with how the roof cleaning turned out. I cant believe the black is gone and my roof is white again! My neighbors even came over the next day and had thought our roof had been replaced...We had a good laugh and gave Marc's info and they too have a clean roof now. We highly recommend Marc's , they are truly expertise in their line of work!...George Pratt , Hampton Va