I would wash them first & see how they come out. If they come out ok you are good to go. I used to live near an interior designer, she sold bolt ends really inexpensively of home dec fabrics ( some were listed at $100 a yard! I would pick up a bolt end with 2+ yards for $15.) I used many very luxurious wonderful fabrics for quilt backs. I took them home, washed & dried them and used them. Most of them were labeled dry clean only, never had one not handle laundering They made heavy quilts but Beautiful!