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black, oily stains on exterior deck

Posted by S Lanctin on August 13th, 2000 04:08 PM

I added a large deck to my home a few years ago, and shortly
thereafter, black, oily stains developped on several of the
boards. They are quite unsightly, and I would like to get
rid of them. I have been told they may be a form of mildew,
and that a solution of bleach, water and soap will solve my
problem. However, I have also been told that bleach will
harm the wood. I am also concerned that the bleach may
cause discoloration.

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