Here is how I launder my quilts:
Fill the washer with water and detergent. Place quilt into the water, gently squeeze until completely wet. Let sit for 30 minutes. Do not agitate. Then, run through spin cycle. Repeat for rinse cycle, omitting sit time. Note, this will not work in a front loader.
I have a 5-line retractable clothesline. I hang the quilt face down over all 5 lines, distributing the weight evenly. Dryers beat the heck out of clothes and wear them out more quickly. Just think what they would do to a quilt!