We have a black discoloration occurring on the wood windows in our house; I was wondering if you knew what it was, and how to get rid of it. The windows are double-hung, and the house was built in 1995. I assumed it was mold and moisture-related, because I noticed it in the bathroom. But, I have since found it in small patches on other windows, both upstairs and downstairs. I have tried many cleaning solutions, including TSP and a bleach/water mix, but none seem to work. Any ideas or suggestions would be greatly appreciated.
If the stains are a dark discoloration that cannot be removed from the surface, you have water damage in the wood of the window. If the TSP removes the stain, it may be dirt or mold. Once the surface finish is damaged by water, the water will discolor the wood. So, if the finish is gone and you have a dark stain, you have water damaged wood.The fix is to refinish the wood by sanding, bleaching, and more sanding. Then, stain and varnish to back to the original finish. Not an easy job.