This link
Tear Staining: The Causes & Cures has some good suggestions for removing the stains, here's one, I haven't tried any, so I can't comment:
Quote:
Milk of Magnesia, corn starch and peroxide (20 volume to 40 volume)
Use equal volume of MOM and peroxide, and then use the corn starch to make a good paste of this; put on and work well into the stained area and let dry overnight. Wash out, CONDITION WELL. Keep doing this for several days until tear staining is gone, although I would recommend skipping a day or two between applications if possible. I also like to use a few drops of Nexus KerapHix in this mixture to help with conditioning.
This MOM formula is my personal preference when I do need to remove tearstain color from the face of my dogs. It works quite well overnight.
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She also mentions several other methods, as well as commercial preparations you can buy.