*Moss removal and treatment can be done anytime of the year and in most cases should be done annually or every other year. Gutter cleaning is needed along with the moss removal and the treatment process. Late fall (November on) is a great time to schedule moss removal and the treatment since your gutters need cleaning at that time of year from the last of the leaves falling.
*We never under any circumstances pressure wash composite shingles or an asphalt roof. We only pressure wash walkable pitched metal roofs for safety reasons.