The present invention relates to a mould drum for moulding products from a mass of food starting material. The mould drum comprises one or more cavities with a mould cavity wall having at least partially a porous structure, whereas each cavity is connected to a passage. The present invention further relates to a cleaning apparatus and a forming apparatus preferably provided with a cleaning device for the inventive mould drum with supporting means for supporting the axis of the drum. Additionally, the present invention relates to a process for cleaning the inventive drum.