How to wash your hands - NHS (www.nhs.uk)
You should wash your hands for the amount of time it takes to sing “Happy Birthday” twice (around 20 seconds):
The problem arises when you don’t know any two people who have a birthday a particular day.
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I always heard it was The Star Spangled Banner if you really want your fingernails clean too.
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They said on the radio that thorough wiping gets rid of the germs more than washing, but you still need to wash in order to wipe.
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