Q: About algae on shingle roofs. ... Is there a best time or two during the year to apply a recommended cleaner with a garden sprayer? A: Although algae stains are unsightly, the stains do little to ...

Q: I have a newer asphalt shingle roof, but parts of it are covered with moss, lichens and algae. Is a pressure washer the best choice for cleaning roof shingles? Will it remove all of this growth?

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 ...

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 ...