This my my current favorite on HGTV network! I am watching a show now where they are dealing with a water stained hardwood floor that has turned dark. I had renters that did that to my house and found a hint online to soak a rag in peroxide and put over the stain over night. Figured what did I have to lose and tried it. It worked. Didn't bleach all the color out, just took it to the original wood color!