I just remembered that when I was in the Army, I was stationed in Honduras. The Hondurans in our area didn't have much in the way of running water and even less for standup urinals (the kind that look like like a trough and went all the way to the floor) . On our base there was a large sign in English and Spanish above the urinals that said...
Please do not wash feet in urinals.
Please do not wash feet in urinals.