Use Retayne to treat fabric before the quilt is constructed. Use Synthropol in the wash cycle to keep any excess dye from transfering. These are two very different products. Retayne will pull out excess and should not be used once a quilt is completed.
The longer it reamains in the quilt the harder it will be to remove. Hopefully you can get it out.
If you put the quilt in the dryer ..... it will be very difficult the heat will set some of the dyes.