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I've just been asked to clean a similar patio but it's only a year or so old and gone Green with algae all the joints are perfect just wondered if I'd be better off just applying hypo on them?

 
I've just been asked to clean a similar patio but it's only a year or so old and gone Green with algae all the joints are perfect just wondered if I'd be better off just applying hypo on them?
I do both. 3-1 hypo sprayed all over, leave 20 minutes, hose it down then pressure wash

 
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