If you drop your soap on the shower floor, it is technically dirty, but you can still safely use it. You only need to pick it up and rinse it for 15 seconds or so to wash away any accumulated dirt ...

Shower gels, on the other hand, depending upon your bank balance, can be dragged on for a few more days. Just add a bit of water, and use just a goddamn drop for the next four showers. Verdict: Water.

Most Americans view soap as essential to bathing as water. The daily grind confronts us with dirt, germs, and sweat, and a soapy shower provides the simple, pleasurable antidote.