How to get people to stop writing graffiti in your restroom, bathroom, or WC

Graffiti is never a nice thing to see in a bathroom. I saw this in a hotel and it worked quite well.


 * Paint your stalls black
 * Put a small chalkboard in the stall with chalk.
 * Since it is way easier to write on the board, people will write on it.
 * If things are written that are offensive, they will be erased by those who are offended.
 * It can be easily cleaned every time the restroom is cleaned

From HowTo Wiki, a Wikia wiki.