posted on
June 11, 2010 at 10:42AM
Using a pressure washer to clean a wood deck is a huge mistake in my opinion. High pressure streams of water easily erode the soft light colored spring wood that is found in between the darker bands of summer wood on each piece of lumber. I have actually cut my hand on pressure cleaned deck handrails. So much soft wood was eroded by a pressure washer that sharp slivers of summer grain wood were left behind. The surface of the handrail resembled an upside down multiple blade razor.
To make matters worse, many of the pressure washed decks I have examined were cleaned by professional deck cleaning companies. If you have no experience working with a pressure washer, the last place to start is a wood deck.
If you want to make an even bigger mistake, then use chlorine bleach to clean your deck! In my opinion, it is the absolute worst ingredient to apply to a wood deck. Chlorine bleach, better identified on deck cleaning product labels as sodium hypochlorite, removes the natural color from your wood, it destroys the lignin or glue that holds together the wood deck fibers, is toxic to surrounding vegetation, and is corrosive to all metal fasteners and components that hold your deck together.
A far better wood deck cleaner is oxygen bleach. This powdered product when mixed with water releases non-toxic oxygen ions that kill mildew and algae. In addition, the foaming oxygen bleach loosens grey weathered wood fibers and dirt from the deck surface. In the process, it does not remove natural wood color, nor does it hurt nails and joist hangers. Possibly one of oxygen bleach's best attributes is that it will not harm plants, vegetation or you