People have always had different opinions on how often they should wash their hair. There are many cultural and religious arguments to back both sides up- some people argue that hair is a symbol of a woman's beauty and purity, while others argue that it's disgusting to expose your scalp so much. However, there have been international agreements made in the past that define what the best time of day to wash your hair would be. In elementary school, it was (and still is) Wednesday morning; while at college or university, it might be Monday evening after you've been partying all weekend.
