I was impressed with the workers and their thoroughness. The surfaces look so much better than before., especially the siding. There was a metal fence, concrete pool deck, sidewalks, patio, and siding treated. I wish i had understood the process of washing the concrete more thoroughly. The washing actually removed and roughed up a bit of the surface. I still would have it done for stains but I wouldn't do it frequently. The company was very co-operative and easy to deal with even when a power failure disrupted the schedule and I was remiss in communication. The force of the water did break a few expansion strips In the pool deck.