I second NB's post at least in reguard to softer woods. I PW my cedar deck and the results he described were very evident. Really exaggerated high and low rings. It did more damage than good. I have used different cleaners with pretty good results and used Sikens after and only had maybe one season of good appearance. My deck is a very large 10 by 40 surrounding my pool and has a high sun exposure. I've pretty much given up on it and will not replace it with wood. FWIW
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