I had a plaid back that was glue basted on "crooked". I tried to peel it apart and it was a mess. I threw the sandwich in the washer. I then dried, pressed and re-sandwiched. It was surprising that the final quilt turned out OK. Batting was Warm and Natural. I thought I'd have to replace the batting, but it was OK. Quilt was for charity, and it was about 50" x 60".