I have several wool blankets set aside for the same reason. I find them at thrift stores, yard sales and such. I have a special one that I use in the winter for traveling as I get cold on the ride. I have always washed that one. I have had excellent luck washing it in cold water and letting it hang dry. Drycleaning is the other method. Try it with a scrap one and see. If the quilt is for a gift, I would recomment adding a tag with cleaning instructions. If you use them in with the batting, just remember they are heavier than the batting and will add weight to the quilt. I was thinking of using them alone in the quilt, I like the more traditional low loft look. Best of luck and let us know how it works out.