It's easiest dealt with during the rainy season. Any other time of the year, wet the black algae or green moss. Soak it for a few hours, best yet over night. When it's damp it can easily be removed with a brush or power sprayer.
My pool supplier recently added a free bottle of 'black algaetrine' to my order to fill a void in the shipping box. The stuff is not cheap from listings on the net, but you can throw away the brushes.
These two photos were taken four minutes apart, poured some on the ground and hosed it off
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