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i think every customer i've had has asked how long will it stay clean i under stand that using apple souce insted of apple cider will keep the roof clean longer because of the borax. lets asume it doesn't rain all day after the roof is cleaned what kind of time frame can i  expect i would like to offer a warranty if i can but i donn't want to do anything im going to regret i live in tampa and it seems to rain daily in the summer time