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The exposed surface that has gone THAT long without a finish is probably sun bleached by now and is turning gray. Ok for the rustic look but doesn't help in making a surface structurally sound. You could try pressure washing but I don't think you'll clear up the weathered wood. For underneath, use large sheets of plastic to route the water so it'll run off and not drip on your patio. they had a episode on the home & gardening thing on tv where they put plastic sheathing underneath a deck to catch the rainwater that made it through the slat openings and routed it out to the ground.
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