Wood decks built with CCA treated lumber should be cleaned and sealed to keep the chemicals from being washed out of them and into the soil. Power washing can destroy a deck by shredding the soft wood on top. Oxygen bleach cleaners are non toxic and clean wood beautifully. Seal your wood decks with a synthetic resin sealer which has no oils to feed the growth of mildew or algae.
Oil based sealants will seal a wooden deck. They will repel the water. They will also feed mildew and algae, allowing the wooden deck to gray out and darken. Seal your wood deck with an epoxy fortified sealer. It has no oils and penetrates deeply into the wood.
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