Just clean your hands
Yes, we could have said it much better ourselves. This may be the simplest yet best message that gets straight to the point of what we’re going to see on this list. Its message is as clear as it’s possible to get.
The sign’s creators didn’t feel the need to mince words or anything along those lines. They wanted to inform the world (and everyone reading the sign) that hand washing is an important habit to acquire. We wholeheartedly agree.