How to Avoid Common Hygiene Mistakes - WikiHow
my pick of the litter:
Wash your hands after using the bathroom. Yes, you might think, "My genitals are clean so I don't have to wash my hands." Wash your hands anyway. If you want other people to wash their hands after using the bathroom, then you should wash yours. Some people leave the stall after defecating and then leave immediately without washing their hands. It's utterly disgusting. And yes, if you use the bathroom and don't wash your hands, your peers who observe this nasty behavior will all talk about you (and not in a good way).