If nothing suggested here on the Board helps, have you thought about contacting Servicemaster? A phone call may put you in touch with a product and/or procedure that is delicate enough for your quilt. Servicemaster has disaster restoration services for fires, etc. Maybe they could suggest something. Good luck. For me, there isn't much worse than cigarette smoke in fabrics. I can't be anywhere near anything that has cigarette smoke on it. Need an inhaler pronto.