Cover system for a load bed of a vehicle having a winding shaft which is rotatably mounted in a support structure, having a flexible flat structure which is mounted such that it can be wound up and unwound on the winding shaft between a rest position and a covering position, and which is connected to a dimensionally stable pull-out profile on its front end region which lies away from the winding shaft, and having two guide rail arrangements on opposite sides of the flat structure, in which the pull-out profile is guided longitudinally displaceably, wherein a cleaning strip is provided in a winding region of the flat structure, which cleaning strip is extended parallel to a rotational axis of the winding shaft and is oriented relative to the flat structure in such a way that, during a winding operation onto the winding shaft or an unwinding operation from the winding shaft, a surface of the flat structure slides past the cleaning strip such that it makes effective contact.