As a chemistry teacherI always used to tell the kids to wash their hands with little action on their part. Until I added, a second or two later, '...BEFORE you go to the toilet'
(
An Egg ,D,
Thu 25 Oct 2012, 20:54,
archived)
Bitrex (Denatonium Benzoate solution 5% w/v) sorts out problems enforcing handwashing.The bitterness at that conc lasts for hours.
(
FeralCatMan Unusual disease collector.,
Thu 25 Oct 2012, 21:18,
archived)