The 'sterilized' sand bit at the end was a nice touch too, alluding to the dominant scorched earth policy we have in regards to shaping the environment in ways we (mistakenly, deludedly) think will be most conducive to our well-being.
Oh but the two aren't mutually exclusive you say? I beg to differ.
Abrasive elements are commonplace in soaps for auto shops and other places where most conventional soaps have a hard time with the gunk accumulated from automotive grease and such. The particulates help to actually scrape off that gunk (in a manner that doesn't cause skin injuries), rather than rely on the hope that soap's chemical properties alone will suffice.
[0]http://www.amazon.com/Alba-Botanica-Revitalizing-Hawaiian-Sc...