We are offering annual roof treatments to keep the moss off for the price of 150.00 plus the cost of the Wet And Forget Moss And Algae Killer of 40.00. 190.00 total and we are able to clean most homes gutters included with that price. It really is a good deal. We will only do the annual treatment if the conditions are right. Heavy rain or a frozen over with frost roof is out of the question. February is kinda a play it by ear each day month.