You may want to check out this thread:
http://www.quiltingboard.com/posts/list/23505.page
It mentions a few products that might help you. I would try a test swatch (sew some of that blue fabric on some white fabric) and see what happens when you use one or products on this thread.
I also have found Dye Grabber (you can get this at JoAnns or some grocery stores) will work to 'grab' dye that releases in the washing machine.
Good luck!