Q - Our roof has dark streaks in various places even though there are no trees directly around our home; our neighbor says it needs to be cleaned. How would we clean the roof? The guy with his ...

QDEAR TIM: My roof needs cleaning. It's a newer asphalt shingle roof, but parts of it are covered with moss, lichens and algae. Is a pressure washer a good tool for cleaning roof shingles? Will it ...