A filling machine for filling open-mouth bags with bulk material wherein the open-mouth bag is at least temporarily received in a container with a cleaning apparatus, and a cleaning apparatus for cleaning a tubular inner wall of the container e.g. from particles of bulk material, the cleaning apparatus including a cleaning device that is movable in the container in a longitudinal direction. The cleaning device has a laminate of a multitude of layers. The layers extend transverse to the longitudinal direction and the laminate includes two end layers having one end face each. One end layer is configured as a top layer with a top surface and one end layer, as a bottom layer with a bottom surface. The laminate is configured with a plurality of outwardly oriented fluid outlet ports for directing a fluid flow toward the tubular inner wall of the container.