A Tip for Creased Batting
If you have some stubborn creased batting, try to spray a mixture of water and
vinegar. The creases disappear almost instantly. I've used it on Warm and Natural.
That's mostly what I use. Don't know about poly.
I spray then iron with a cloth in between. If it's for a bed quilt I would probably
throw it in the dryer after spraying.
I saw this tip here for using water/vinegar on fabric and thought why not try it
on batting and it works.