I've had good results washing warm and natural - but I purchased mine maybe 15 years ago now - dries beautifully.
Quilter's Dream packaging says "Do Not Wash" and supposedly shrinks only about 1%. The lady that did the quilting for that quilt said it worked up nicely - but when I took it out of the package (king size batt) - it stayed wrinkled and warped - I did the mist and dryer thing - and it still seemed warped.