Hi Laydijayni, and thank you for posting your question on Mrs Clean's forum.
According to the wood repair experts, this process should take care of the problem. As always, I recommend to test a very small out of the way area first.
Step 1: Mask off the stain with painter's masking tape.
Step 2: If the wood has a wax finish, use steel wool, if it is a polyurethane finish, use a medium grade sandpaper to start, finishing with a fine grade sandpaper to remove the finish. Remove all of the finish just up to the edges of the unaffected boards
Step 3: Mix Oxalic acid crystals in 1 cup of hot water, and stir to dissolve. (Oxalic acid is available in hardware or paint stores.) Continue adding the crystals until they will not dissolve further.
Step 4: Sponge the mixture onto the water stained area, and let it dry completely. Brush off the crystals, and repeat the process until the stain is completely removed.
Step 5: Stain, seal and refinish the affected area.
Some additional resources to remove wood stains:
http://www.ehow.com/how_4490265_remove- ... oring.htmlhttp://www.onlinetips.org/water-stains-floorshttp://ideas.reliableremodeler.com/Article.aspx?ID=1087Good luck with your repair, and let us know how it turns out!