SAN FRANCISCO >> San Francisco now has nine public walls covered with a repellant paint that makes pee spray back on the person’s shoes and pants.

The San Francisco Chronicle reports Friday that it’s the city’s latest attempt to clean up urine-soaked alleyways and walls.

Signs reading “Hold it! This wall is not a public restroom. Please respect San Francisco and seek relief in an appropriate place,” hang above some walls.

The signs don’t explicitly state that the wall will fire back, the newspaper reports.

Public urination has long been a problem in San Francisco. Legislation banning it in 2002 has seen little success, despite a fine of up to $500.

The paint has proved to be effective in Europe. It was applied to walls in Hamburg’s St. Pauli quarter, where beer drinkers often can’t be bothered to find a bathroom.