Finally the principal decided that something had to be done. She called them all to the bathroom and met them there with the maintenance man. She explained that all these lip prints were causing a major problem for the custodian who had to clean the mirrors every night (you can just imagine the yawns from the little princesses). To demonstrate how difficult it had been to clean the mirrors, she asked the maintenance man to show them how much effort was required.
He took out a long-handled squeegee, dipped it in the toilet, and proceeded to clean the mirror with it.
Since then, there have been no lip prints on the mirror.
There are teachers.... and then there are educators.