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It’s bit ridiculous to ask for a citation for something as simple as washing hands. You could try for yourself during a week and see if it change something.

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Just to play along here....how do you propose that they check whether the cold water removes bacteria more effectively?

They were referring to difference between hot vs cold water and it drying out your skin, not the effectiveness of cold vs hot water at sanitizing.

I read the "paranoia about cleanliness" bit as suggesting both.

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