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.
After much research, I surprisingly learned new modern appliances are made to be replaced in just 5-12 years max, I know crazy?! Decided to fix my dryer (which was probably already 15 years old) because these legacy appliances are made...