In my experience, once a fabric has developed a "smell" whether its from humidity, dust, lack of air so the chemicals in the fabric take over, you won't get rid of the smell until the fabric is washed. Any new fabric placed with the older fabric will adopt the same smell. All of the above recommendations are good for clearing the air in the room, but not in the fabric. Seems you have two choices, wash all the fabric now and cure the cause or wash the quilts when they are finished to remove any oder.