Abstract: The invention relates to a cleaning device (100) for cleaning a container, in particular an inner wall of a container, comprising: a base member (1) that can be coupled to a feed pipe for supplying a cleaning agent, a rotating member (3) mounted rotatably about a rotational axis (A) on the base member (1), a support member (2) having a first end portion (16) and a second end portion spaced apart along the rotational axis (A), wherein the first end portion (16) can be coupled to the base member (1) and the second end portion to the rotating member (3) in such a way that in the coupled state the rotating member (3) is rotatably accommodated between the base member (1) and the support member (2), wherein the cleaning device (100) further comprises a coupling means (15) which is adapted to lock the support member (2) in place relative to the base member (1) in the coupled state. The invention also relates to a method for assembling a cleaning device (100).