A roof can look fine from the driveway while quietly collecting moss, algae, leaves, grit, and trapped moisture. By the time dark streaks or green patches become obvious, the buildup has often been there for months. Roof cleaning is one of those home maintenance tasks that protects both appearance and function. A clean roof sheds water better, allows problems to show sooner, and helps roofing materials age the way they were designed to age. Done poorly, it can also cause dama