Device for cleaning the external surfaces of vehicles

The device has drive motors for driving brushes and for operating a chassis. Portal rods between horizontal and vertical positions are swivelably arranged at a chassis, which is movable on a fixed base. A component of a chassis frame of a trailer (1) is linked with few handles with chassis frame or detachable from the handles, where frame is connected with a pneumatic tired axle and trailer is permitted for public road traffic. An independent claim is also included for a method for using a device for cleaning the external surfaces of a vehicle.