I wash and dry mine twice - once at the laundromat so that the first round of lint doesn't clog my machine and the second time at home. I do see a difference in the ragging between the first and second washes.
For the second quilt, I added a few towels to the wash and I think the rags were a little softer/fuzzier than on the first quilt. Plus it reduced my stack of towels to wash.
Cheers, K