Gall soap is an ancient household remedy for removing the most stubborn stains on wool and silk textiles. Gall soap is used whenever wool shampoos are not enough to remove a stain. Apply the gall soap to the affected area, massage gently into the stain and rinse with clear water. The bile soap removes any organic soiling from wool and silk articles. Available as a concentrate and only intended for targeted stain removal, a few drops will suffice to remove ugly stains from delicate materials. 200 mL.