I got a crib size quilt top at an estate sale couple years back. I stitched around the outside edge before washing. It had not been pre washed before but was glad I did. It bled a little. Some fraying but not like if I had washed on normal cycle. Threw into the dryer. Trimmed away the small amount of fraying pressed and looks good. It's all preference. Like I said it was crib size.