The methods described below only work if maintenance is frequent. If debris is left on the roof in a moist and shaded area more extreme cleaning measures will be necessary. All of which will shorten the life of your roof, and can cause leaks. Debris Removal- Debris should be removed with a leaf blower, or water from a garden hose. Leaf blowers work best when debris is dry. If the volume is too great combine the use of light brooming, and water from a garden hose. DO NOT PRESSURE WASH! Moss Removal- The length of time that the moss has been on the roof, and the type of roof it is on will determine the method for removal. If the moss is recent and light use of a moss killer may be required. (There are many types, both chemical and organic) However you may be able to lightly broom the moss off of the roof. If the moss has embedded itself beyond the point of a simple broom job then a Moss Killing product will be necessary. These products typically work very quickly (Within 1 day) Apply the product according to manufacturer’s recommendations, wait for the moss to discolor and die, then remove with non abrasive broom.