so it sounds like you have quilts that have been donated to be quilted and turned over to a charity? I think you need to make a "call" on this--if truly moldy--toss. If they are just smokey/dirty and reasonably well made and your long armer wants to go to the effort, then I would put them into a plastic laundry basket and into the bath tub with a quilting soap and dip up and down, rinse,etc--all in the basket. And then lay them out flat to dry (probably do a little blocking at this point if needed) before quilting. If still smokey smelling, then bag with an opened bar of Irish Spring soap. But as a long arm quilter, I must say that sometimes quilts come my way to "quilt up for charity" that I'd rather not because of the way it's made, time needed, donation of my time and bat/backing materials, etc. So if these are being prepped for a long armer please consult with them too!