At most coffee shops and restaurants there is a sign in the restroom that says:
Employees must wash hands before returning to work.
That's great. I'm glad that employees must do that.
I think we should aim higher though. I'd like to see a sign that says:
All human beings must wash their hands before leaving this room.
To start, I'm going to post that sign in the bathroom at home. After all, there are some human beings at home that could use that reminder.