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In this Thursday, July 30, 2015, photo, a sign above a wall asks people to hold it 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 person's shoes and pants. It's the city's latest attempt to clean up urine-soaked alleyways and walls. The paint has proved to be effective in Europe. (AP Photo/Eric Risberg)

In this Thursday, July 30, 2015, photo, a sign above a wall asks people to hold it 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 person's shoes and pants. It's the city's latest attempt to clean up urine-soaked alleyways and walls. The paint has proved to be effective in Europe. (AP Photo/Eric Risberg)

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