I found this article. I haven't tried any of the techniques yet so don't take my word on it. If anyone else has tried these methods please chime in.
Article:
Removing the dye is not as easy as you would think, and all the bleach in the world usually won't make it better.
There are, however, some things you can try.
Automatic dishwasher detergent
If you're going to try this, you have to use liquid or gel, not powdered detergent. Add this to the wash water while it is filling in the washing machine. Use about 1/4 cup for a small to medium load. Washing in smaller loads works better and warm water works better than cold. Do not apply detergent to the clothes and allow the machine to fill prior to adding clothes. If this doesn't work, here's some products that might.
Synthrapol
This is a product actually used by quilters to remove colors that have run in quilts. Use it according to directions in a basin or washing machine, depending on the size of the garment.
Synthrapol works best on cottons, but I have had success using it on polyester and blends, too. Try it in an inconspicuous spot unless you feel you have nothing to lose. Follow the directions carefully. Buy this where quilting supplies are sold.
Carbona Color Run Remover
This is available in grocery stores and discount stores. It is important that you follow the directions and read all of the precautions on the product. It may damage zippers, buttons, etc., so use with care.
Retayne
This one is another great product used by quilters. This is a color fixative for cottons. Use it before washing to ensure that the color won't run. It will also keep colors bright longer.
