I've washed Warm and Natural on a gentle cycle in my machine and dried it on a gentle cycle in the dryer.
Turned out fine.
(This is batting that I purchased 15 (or so) years ago - the construction of the batting may have changed since then.)
I like the flat look of quilts - so that was the first washing.
The cream colored batting turned the wash water very yellow.
The second washing of the batting was because something "unpleasant" was deposited on it.
I did completely destroy some other battings by attempting to wash them.