SOAP BARK, or Quillai Bark

the inner bark of an evergreen tree growing in the mountainous parts of Chile, which, when bruised and agitated in water, makes a lather as soap does. It is believed to take its name from the native word quillay, which signifies "to wash." Commercially, it is employed for removing grease from silks, as it does not change the color of the fabric, and also in the form of a hair wash.