It is my opinion that the higher priced fabrics are the ones that have the most bleeding. I mostly buy mid range priced fabrics. I always use two or three color catchers and reuse them for a long time. How many I use depends on the size of the quilt. I use any detergent as I figure when given away, they will not get any special treatment. I will try the blue concentrated dawn for my regular laundry, to remove greasy dirt.
Thanks for posting all this helpful information.