Here is a demonstration of some traditional Native American backcountry know-how on making soap from yucca (Yucca whipplei). It is, admittedly, esoteric knowledge that is obsolete in the current age of abundance where innumerable soap varieties are available in countless stores. It is a novelty rather than a necessity.
Though a chore to make, yucca soap works remarkably well and a thick, slimy lather quickly foams up. Of course, make sure not to be washing up in the creek upstream from people who may be using the water down the canyon!
I shot the video with an iPhone, hence the poor quality. I couldn’t get my other camera to work for some reason.