There are different cleaning methods depending on the source of roof discolouration - blue-green algae leaves black streaks on the roof come from blue-green algae, while moss leaves green patches on the roof. Experts recommend using a garden hose filled with chlorine and water to clean the roof.
I spoke to someone from Maydone first thing the morning after I left my request for service, and Alex was at our house the following day. He was friendly and funny -- still working on his English, but handy w/the...