I would definitely second the salt remedy. That's what people used to use with the RIT dyes to help set the colour better. Be fairly generous with it and hand wash them in a sink so you don't end up with salt all over your washer. Silly question, but are you making sure that you wash them in very cold water? If nothing else works, then I'd say just wash them until they stop bleeding into the water....you may be left with faded jeans, but at least they won't ruin your other clothes.