I usually load my backing and bat the night before I plan to quilt. I'll spray the batting, especially the creases, and roll back and forth. then I lay out the bat and if need be, give it a spray of water and let it lay/hang over the edge. almost always by the time I get ready to quilt the wrinkles are gone. I've not had good luck washing and drying a bat. Have not tried just putting into dryer with wet towel.