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I was told by some contractor that the moss (he thought there was mold as well) will transfer to the deck, and it should be cleaned by power wash before repainting the deck. However, my tenants don’t want us to power wash the house before they move out next year, but they are okay with deck repainting, and it seems I have to get the deck repaired and repainted before the winter. May I just clean the deck and paint? Will the moss on the siding affect deck repainting in short term, e.g. 1 year?

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bobby_yan
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That's not moss. It's Artillery fungus or something similar (mold), and it's everywhere. Cleaning it off your siding will have no significant effect on your deck.

isherwood
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