Do NOT wash...carefully rip out the quilting stitches. You could spot clean or simply vacuum (on low vacuum with a nylon stocking over the end of the tube). Do not hand wash or machine wash until it is requilted. If the batting is cotton I would recommend replacing it with something less apt to shred/lump than the old fashioned cotton batting. Looks like a beautiful quilt so remake it the best you possibly can so you can enjoy it for many years.