They came knocking at my door because my roof needed cleaning. It did, so I hired them. The two of them seemed knowledgeable about the business in general and specifically about how to deal with my metal tab roof. They were hard working and did a great job. They blew off my roof, lightly pressue washed it, washed my patio roof and picked up all the debris from the ground and even rinsed off my car. I recommend them.