We hired Alpha One to power wash our house including the roof, which along with our deck and two sides of the house had some thick green mildew and moss. All I can say is the house looks like it was just built. The deck looks almost new. We can't say enough about how nice the father and son team were. We are telling all our neighbors who have been remarking what a wonderful job we received. Well worth twice the money and the nicest person you will ever meet.