If it was me, I would buy cotton sheets, wash them, and use them to separate the quilts.
Do you have a sewing machine?
I do have a machine, so this is what I would do.
I would tear each length about 8 inches longer than the longest quilt lo allow for shrinkage. Then I would overcast the ends so they would not fray - and you could use the muslin for table cloths of couch covers -
Then I would wash and dry the fabric.
There may or may not be chemicals in the fabric -