I have an 18 year old deck with a wolmanized sub- structure and all cedar decking and railings. Some of the cedar deck boards are rotting on the ends and edges from excessive moisture. The sub-structure has no damage. I am replacing the boards (2x6) which either just look bad or are unsafe. I have removed a large tree which kept the deck in shade most of the time to help dry it out. I am left with a large number of boards with minor moisture damage. Is there a product that will kill the fungus or whatever it is that causes the rotting? I have heard of a borate (boric acid?) treatment but I would like to hear from anyone who has actual experience with this or any other solution.