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In this July 30, 2015, photo, Mohammed Nuru, director of San Francisco Public Works, talks about the city's latest effort to clean up urine-soaked walls outside a Mission District transit station in San Francisco. San Francisco now has multiple public walls covered with a repellant paint that makes pee spray back on the offender. (AP Photo/Eric Risberg)

In this July 30, 2015, photo, Mohammed Nuru, director of San Francisco Public Works, talks about the city's latest effort to clean up urine-soaked walls outside a Mission District transit station in San Francisco. San Francisco now has multiple public walls covered with a repellant paint that makes pee spray back on the offender. (AP Photo/Eric Risberg)

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