I would hesitate to use on a quilt without knowing more about the fabric composition. The lining could be dry clean only because it's a room darkening or heat retaining chemical treatment on it. You can do a "burn" test to see if it's cotton vs. poly (poly "melts") but as far as washing, you could cut off a piece (I'd do at least FQ size) and run through washer & dryer--if it survives, use it. If not, you have your answer before you go any further.