I am in Canada and we can buy a product that you put in the washer to catch colors so they won't bleed. Maybe you have this or something similar in the US. Here is a link and a photo of the product.
http://www.shoutitout.com/en-US/Prod...r-catcher.aspx
PS: I have a friend who used a similar product that she bought at a fabric store in Canada and she said it worked great on a quilt that she was concerned about washing.