Device for cleaning the outer surface of the circumferential wall of plant pots, including: a frame; a pot track arranged on the frame, which track extends from an input end to an output end and forms a support surface for the plant pots; a movement device for moving the plant pots from the input end to the output end; a rotation device for rotating the plant pots about their pot axis; a brush for brushing the outer surface of the circumferential wall of the plant pots during the movement; a first brush drive for rotating the brush about a lying axis; and a second brush drive for moving the rotating brush up and down, while engaging the pot's circumferential wall, between a first position and a second position, wherein the first position is situated at a lower level than the second position.