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.
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I've been doing handyman and renovation work for the last 35 years, in both the residential and commercial fields. I have lots...Read more
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