A handwashing medium which may be in liquid, cream, powder or spray form is provided with a detection agent such as an invisible fluorescent or phosphorescent additive, which combination is then rubbed onto one's hands using the individual's handwashing technique. The individual's hands are rinsed with...http://www.google.se/patents/US5900067?utm_source=gb-gplus-sharePatent US5900067 - Handwashing technique analysis
