BVG launched the cleaning patrol project a good year ago in a test phase on the notorious U8 subway line and later extended it to other lines such as U5 and U7. According to surveys, the cleaning patrol was rated positively by almost all passengers, the BVG announced. There is also a high level of approval among employees. In future, the patrols will continue to operate on the U5, U7, U8 and U9 lines, for example at the Hermannplatz, Yorkstraße, Leopoldplatz and Frankfurter Tor subway stations. Transport Senator Ute Bonde said that the cleaning patrols would also contribute to greater safety. "Where it's clean, there are fewer assaults," said the CDU politician.