I heard this tip from a quilter who has won multiple awards, including Road to California and several AQS shows. If the bleeding is in one spot, not all over the quilt, dampen a color catcher and place it over the bleed. Weigh the color catcher down with something heavy (and perhaps a white paper towel between the color catcher and the heavy object). Leave it several hours or overnight. It should wick the color out. You may have to repeat the process a few times. She said she did this on a quilt that won at RTC.