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Degreaser and a steam cleaner (the kind they advertise on TV that shoots a jet of steam at whatever surface you're cleaning. Put a tarp under the deck, and once the degreaser soaks in, spray it with the steam and soak up what comes out with a sponge. It's best to spray at an angle and have the sponge (soaked in degreaser then wrung out) right in front of where you're spraying.
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