Last year I took a quilt to a long arm quilter to finish for me and prewashed the flannel (good quilt quality) and pre-soaked the Warm & White batting. I thought it looked okay but when she looked at it, we realized that it had been felted by putting it in the dryer (I've not had troubles with the Warm & Natural batting before and I always pre-soak & dryer dry it before quilting them on my Bernina). Anyway, she advised me to not pre-soak batting.