Bath twice a day to be really clean, once a day to be passably clean, once a week to avoid being a public menace.
Anthony Burgess (1917–93), author
I’m in a state of confusion now. I am a major proponent of hand washing frequently (see the posts just over their to the right Try a Little Cleanliness and the companion piece Urinal Selection Strategy), and especially after using the restroom, but a report in "Science Magazine" points out that:
Physical cleansing has been a focal element in religious ceremonies for thousands of years. The prevalence of this practice suggests a psychological association between bodily purity and moral purity. In three studies, we explored what we call the "Macbeth effect"—that is, a threat to one's moral purity induces the need to cleanse oneself. This effect revealed itself through an increased mental accessibility of cleansing-related concepts, a greater desire for cleansing products, and a greater likelihood of taking antiseptic wipes.
I believe most people 8 out of 10 will return your wallet or tell you that you dropped money – it’s just a guess. So, the study in "Science Magazine" may very well explain why most people don’t wash their hands. Now, I’m waiting for the study on why men spite in urinals and most times don’t flush them.