Join Date: Nov 2009
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Here is one summary from woodzone that addresses options. I recommend that you try one, nuetralize, let dry, and then try another if that doesn't work. Whatever you do, please let us know the results.
"Two-Part bleaches are a combination of sodium hydroxide and hydrogen peroxide. These bleaches are used to lighten the natural color of the wood. They are sold in separate containers because they chemically neutralize each other when mixed. When the chemicals are mixed on the wood itself the reaction removes the color from the wood. They can tend to remove the luster from wood as well so care should be taken to test the results on a piece of scrap wood. Two part bleaches remove the natural color of the wood and bleach it to an off-white color. This type of bleach is also en excellent choice when you need to even out the color variations between heartwood and sapwood before applying a stain. The sodium hydroxide in two-part bleaches can burn your skin so care should be taken to protect your skin and eyes.
Chlorine Bleach can be used to remove dye stain from wood in much the same way that it removes color from clothing. Household bleaches such as Chlorox can be used but they tend to be weak and require multiple treatments. The shock treatments used for swimming pools contain a higher concentration of chlorine bleach and can be used for a more-aggressive bleaching treatment. Chlorine bleaches can also be used to remove some food stains such as grape juice.
Oxalic Acid is an excellent choice for removing iron stains and black water rings from old furniture. It is sold in a dry crystal form and is available at most hardware stores. You will often see oxalic acid labeled as "Wood Bleach" so check the label to make sure you are getting the right product. It can also be used to remove some inks and pigmented stains. Oxalic acid is also often found in deck cleaners because it works well with old weathered wood."