I did not wash the dark navy backing fabric, although the LQS lady said I might want to do that. I wanted it quilted right away, and now I have it home. I washed a scrap of the dark navy and it bleeds badly. I would like to do as little damage as possible.....so should I wash/rinse in cold water with the dye catchers? Then set with vinegar and salt? I am sewing down binding now. I need to get this to a brand new big brother very soon. Can you help?