from The Committed Sardine Blog
According to a news report, a certain school that will remain unnamed was recently faced with a unique problem. A number of 12-year-old girls were beginning to use lipstick and would put it on in the washroom.
That was fine, but after they put on their lipstick they would press their lips to the mirror to blot it and would leave dozens of little lip prints. Every night, the maintenance man would remove them and the next day, the girls would put them back. Finally the principal decided that something had to be done.
The solution really works. After that, there is no more lipstick marks on the mirror, EVER.
Answer below by highlighting.
[The principal] called all the girls to the washroom and met them there with the maintenance man. He explained that all these lip prints were causing a major problem for the custodian who had to clean the mirrors every night. To demonstrate how difficult it had been to clean the mirrors, he asked the maintenance man to show the girls how much effort was required.
The maintenance man took out a long-handled squeegee, dipped it in the toilet, and cleaned the mirror with it.