pressure washer
My 15 year old dock and deck were green and even black with age and mildew. I used a $100 electric ( i.e. relatively low power) pressure washer and the whole deck and dock came out looking like new. The key is not to use too much pressure or the wood will start to lift. I followed up the cleaning with Thompson's Waterseal Waterproofing Stain after the deck had dried for several days.
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