[wvguy]

I totally understand your frustration on moss and mold growning on your deck. Last year was one of the worst years in the east for rain and up and down temperature change. My deck had mold on it and i clean it twice a year. To your question. Bleach is very very harsh when used straight on a deck and I would never recommend it. Bleach straight will dry out and split deck boards and shorten the life of the wood. Best thing ever to clean a deck with is Olympic Premium Deck Cleaner. Yes it has bleach in it but it also has many soaps that will help remover dirt and lift dirt and mold to surface. With that said I would clean your deck this year with a deck cleaner and then use a toner or semi-transparent stain Maximum by olympic is great i have found. One thin coat is all u need to stain and seal the deck.
Hope that answers all if not please ask.