Clean springing isn’t just for the inside of your home but the outside surfaces and your roof. Moss is active growth from harsh winters and spring rains. Clean sidewalks, patios, decks and driveways. Inspect your roof especially the North side. Remove moss and treat to deter active growth.Moss is a living organism and eats into the roofing materials. It is easier to prevent moss growth then it is to remove it. Treatment and preventing also extends roof life.