As the story goes, a middle school was faced with an unique problem:

A number of girls were beginning to use lipstick and would put it on in the bathroom. That was fine, but after they put on their lipstick they would press their lips to the mirror leaving dozens of little lip prints.

Finally the principal decided that something had to be done. She called all the girls to the bathroom and met them there with the custodian. She explained that all these lip prints were causing a major problem for the custodian who had to clean the mirrors every day.

To demonstrate how difficult it was to clean the mirrors, she asked the custodian to clean one of the mirrors.

He took out a long-handled squeegee, dipped it into the toilet and then cleaned the mirror.

Since then there have been no lip prints on the mirror.