A recent study by A London School of Hygiene And Tropical Medicine team used sensors to examine the reactions to hygiene messages displayed in service station toilets.
They discovered that people are much more likely to wash their hands after using the bathroom – when they think other people are watching them!
Being perceived as being dirty by other people, even strangers, has proven to be a strong influence in encouraging people to wash their hands.
“Dr Curtis said: "Hand-washing is one of the most effective interventions in preventing disease, especially in developing countries where over 1.5m kids a year die from diarrhoeal disease.
"Hand-washing with soap could prevent half these deaths-saving a million lives a year."
http://news.bbc.co.uk/1/hi/health/8305670.stm
Also see the Hull based Wash Your Hands campaign