Look for Zout in the laundry aisle. It is a liquid product for stain removal. Trace around the seamlines of the offending block and wash. Bleeding disappears. I had a mini with some red squares in it (1/4" square) and they bled to the light colored squares. I squeezed a thin line of Zout on the bled areas and soaked the mini in a bowl of cool water for just a short time. When blocks were clear I rinsed in cool water, then rolled the quilt between a terry towel and squeezed excess water out. It worked for me!