I didn't even know I had a problem until I stumbled accross this thread! Oh I knew we had black spots on our two decks and stairs but I would apply bleach and then pressure wash every year and get rid of them for awhile. At first it cleaned the deck for most of a year. But as time went on the black spots showed up sooner and sooner. Last year it was "clean" for only 6 weeks. After reading this thread, and much thinking about an overall plan, I came up with the plan to apply corta clean, pressure wash it off and then apply wet and forget. My thinking was corta clean would clean it off and wet and forget would keep it clean for as long as possible.
Here are the results so far. Application went as planned. The corta clean is absolutly temperture dependant. The warmer it is, the faster it shows visable difference. If your not worried about speed then apply at lower 60's. The main thing is it works! It cleaned the black spots off like never before. As for the wet and forget only time will tell. It does also work on black spots as I left some deck for w&f only. But the combination is what I will use from now on. I will try to remember to post later when I start seeing black spots reappear to give you an idea of how long the combination lasts. The only down side that I saw was the plants along side the deck did not like something as they burned just as badly as if I had used bleach. I don't know if it was the combination or one or the other.
In summary, there is hope out there and hopefully some of you with problems will get some take-home points from this thread and get your decks looking brand new again like I did. Thanks again to all of imput.
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