Hours of fascinating reading. Also, you can wash yourself with it.

This is a liquid without which I simply couldn'tlive.

I purchase one thirty-two ounce bottle of Dr. Bronner's Peppermint Liquid Soap per year, which is really all I need.  This stuff is pretty concentrated, so it only takes a half-dozen drops to get through a whole shower, or two or three to shave or wash my hair. 

Of course, I can also use it to do dishes or wash dead bugs off the front of my truck.  This concoction can do anything.  I even tried brushing my teeth with it once.  It's non-toxic, so you can do that, although I wouldn't recommend it.  (Upside: minty-fresh breath.  Downside: soapy-fresh breath.) Read more.