YOU HAVE A PROBLEM!
You are the janitor at a junior high school. You are very tired of cleaning the mirrors in the girls’ room. The girls have been putting on lipstick and then using the mirror to spread it. In the process the mirror becomes smudged with lip prints. It is taking you an extra hour a day to clean the mirror, time better spent elsewhere.
Having the principal tell the girls to stop using the mirror hasn't worked.