For those times when you want to wash long yardage ( more than 2 yards) the accordion fold and pinning the selvages with very large safety pins has worked well for me. I trim the cut edges with pinking shears or baste stitch them if you don't have pinkers.
Then fold the fabric and use large safety pins every four inches along the selvage edge to hold all together.
After it comes out of the washer it may look a mess, leave the pins in and shake the fabric out.
If you are drying it in a dryer just pop it in or dry it on a cloths line. It was a brilliant idea which I learned so long ago I don't remember who it was but Kay Wood comes to mind.
peace
EDIT: A good reason for doing this sometimes is if you are using a border print in a quilt you don't want to piece it together for length. Having a nice single piece looks better.
Last edited by ube quilting; 04-19-2017 at 03:18 AM.