A look at restroom hand washing.

https://www.self.com/story/toilet-plume-poop-spray

https://www.cdc.gov/handwashing/why-handwashing.html

https://www.livescience.com/37326-bathroom-hand-washing-habits.html

https://www.vice.com/en_uk/article/bjp8a4/people-explain-why-they-dont-wash-their-hands-after-peeing