SAN FRANCISCO (CBS/AP) — San Francisco officials say they plan to double the number of walls coated with pee-repellent paint because the program to stop people from urinating in public places is working.

Public Works Director Mohammed Nuru tells the San Francisco Chronicle that eight more walls will be painted next week in three of the most problematic neighborhoods.

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In July, the public works department painted nine walls in the Tenderloin, the Mission and South of Market neighborhoods.

The surfaces make urine bounce right back onto the shoes and pants of unsuspecting relief-seekers.

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The paint was first used in Hamburg, Germany, where beer drinkers often can’t be bothered to find a bathroom.

Signs over the walls read, “Hold it! This wall is not a public restroom. Please respect San Francisco and seek relief in an appropriate place.”

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