SAN FRANCISCO — Public urination has gotten so bad in San Francisco that the city has painted nine walls with a repellant paint that makes pee spray back on the offender.
It’s the latest effort to address a chronic problem in a city where the head of public works calls himself Mr. Clean: Walls are coated with a clear, liquid repellant material that goes on much like paint. Any urine that hits it splashes back on a person’s shoes and pants

In this Thursday, July 30, 2015, photo, Mohammed Nuru, director of San Francisco Public Works, demonstrates how water bounces off a wall covered with repellant paint outside a Mission District transit station in San Francisco. AP Photo/Eric Risberg