I used to wash all of my fabrics in the "regular cycle" and had lots of tangles regardless of clipping the corners. Then I thought about how I was going to launder a quilt once finished: the "gentle cycle". So, from then on, I only launder my quilting fabrics on the gentle cycle in cold water, med/hot dryer and removed before completely dry. I also found that the fraying was minimal and I don't clip corners or serge the edges.
Suzanne