A demonstration showing how to make soap from the core of a yucca plant (Yucca whipplei). Of course, make sure not to be washing up in the creek upstream from people who may be using the water down the canyon! Ideally, one should never add anything to a stream. Typically, I cart water from a creek for use away from the streambed.
This video is part of a post published on Jack Elliott's Santa Barbara Adventure blog: http://yankeebarbareno.com/2012/02/09/making-soap-from-yucca-video/