What’s something people do that they think is clean but actually isn’t?

What’s something people do every day that they’re convinced is clean but is actually pretty disgusting when you think about it? There are so many habits we’ve normalized because “everyone does it, but some of them might be doing the opposite of keeping things hygienic. From cleaning routines to personal habits, I’m curious what things made you realize, Wait… people actually do this?

What’s a so called clean habit that secretly grosses you out?