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I live in south Florida and want to clean my concrete tile roof. The roof is quite dirty but I don’t think its moss. I have tried 50/50 solutions of bleach 8.65% with marginal success. If I use shock and use 50/50 ratio do I have to rinse and if so how long should I leave it on. thx great site.
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No just leave it on. Or you could rinse it once it’s clean.