A cleaning apparatus is provided for cleaning crops, such as potatoes or beets, with adhering particles of soil and the like. The apparatus comprises a charging and or supply hopper with an opening at its underside from which the crops enter for cleaning; a housing with a cleaning region, wherein the crops are cleaned; a rotating screen drum rotating about an axis of rotation wherein the crops are cleaned; wherein the screen drum is arranged in the cleaning region; the axis of rotation of the rotating screen drum is inclined at an acute angle.