I have had a great deal of success with oxiclean, the cheap one from Walmart. Dissolve about a cup in hot water and then add cold. Fill in washer and just gently push quilt down into it. Soak at least 24 hr, gently agitate and spin out on gentle. Then let fill with rinse water, agitate gently again and spin on gentle. I then hang on my deck rail so not all weight is on an end. This has worked several times for me.