ECS gets it done! We had not done anything to our roof in 17 years. We live on a heavily wooded lot and that means mold and other "gunk" growing, damaging, and discoloring our roof. Their process cleaned it beautifully. I also had the house washed as well. I had done it several times with a power washer, but they got it cleaner than I ever have. Also did the driveway. Took away years of sludge and gunk. Looks beautiful. Nice guys on the crew. They got a late start on this project due to ice on the roof but they persevered and came out with outstanding results. Can hardly wait for things to dry out a bit so we can really enjoy their results! Highly recommend this crew and their process. You can get it done cheaper from other folks, but in this case - you get what you pay for! This is worth it!