Calling all the girls to the bathroom, the Head met them there with the site agent. The Head explained that all these lip prints were causing a major problem for the site agent who had to clean the mirrors every night (you can just imagine the yawns from the little darlings). To demonstrate how difficult it had been to clean the mirrors, the Head asked the site agent to show the girls how much effort was required.
So, he dutifully took out a long-handled squeegee, dipped it in the toilet, and cleaned the mirror with it.
Since then, no lip prints on the mirror.
There are teachers.... and then there are educators
