System for moulding three-dimensional products from a mass of one or more food starting materials which are suitable for consumption, in particular human consumption, which system comprises: - a production device having: - a frame, - a mould drum which is removable from and rotatable with respect to the frame about an associated axis of rotation, which mould drum is provided with one or more mould cavities each having a mould cavity wall, which is formed at least in part by a wall part with a porous structure, and wherein one or more passages are provided which are in communication with each mould cavity of the mould drum, so that a medium can be forced through the porous mould cavity wall to release the moulded product from a mould cavity, - mass feed means for feeding the mass to the one or more mould cavities of the rotating mould drum, wherein the one or more passages extend from one head-end face of the mould drum, whereby the system furthermore comprises - a mould member cleaning device is adapted to be coupled to said one or more passages in such a manner that cleaning liquid can flow through the said passages to said mould cavities and is designed to force at least one cleaning liquid through the wall parts with the porous structure into the mould cavities, which mould member cleaning device is arranged at a distance from the production device, the mould member cleaning device comprising: i) a collection trough for cleaning liquid and a cover, so that cleaning of the mould drum can take place in a closed chamber; ii) spraying means for an initial coarse cleaning; the system further comprising - conveyor means for conveying the mould drum between the production device and the mould member cleaning device. - a production device having: - a frame, - a mould drum which is removable from and rotatable with respect to the frame about an associated axis of rotation, which mould drum is provided with one or more mould cavities each having a mould cavity wall, which is formed at least in part by a wall part with a porous structure, and wherein one or more passages are provided which are in communication with each mould cavity of the mould drum, so that a medium can be forced through the porous mould cavity wall to release the moulded product from a mould cavity, - mass feed means for feeding the mass to the one or more mould cavities of the rotating mould drum, wherein the one or more passages extend from one head-end face of the mould drum, whereby the system furthermore comprises - a frame, - a mould drum which is removable from and rotatable with respect to the frame about an associated axis of rotation, which mould drum is provided with one or more mould cavities each having a mould cavity wall, which is formed at least in part by a wall part with a porous structure, and wherein one or more passages are provided which are in communication with each mould cavity of the mould drum, so that a medium can be forced through the porous mould cavity wall to release the moulded product from a mould cavity, - mass feed means for feeding the mass to the one or more mould cavities of the rotating mould drum, wherein the one or more passages extend from one head-end face of the mould drum, whereby the system furthermore comprises - a mould member cleaning device is adapted to be coupled to said one or more passages in such a manner that cleaning liquid can flow through the said passages to said mould cavities and is designed to force at least one cleaning liquid through the wall parts with the porous structure into the mould cavities, which mould member cleaning device is arranged at a distance from the production device, the mould member cleaning device comprising: i) a collection trough for cleaning liquid and a cover, so that cleaning of the mould drum can take place in a closed chamber; ii) spraying means for an initial coarse cleaning; the system further comprising i) a collection trough for cleaning liquid and a cover, so that cleaning of the mould drum can take place in a closed chamber; ii) spraying means for an initial coarse cleaning; the system further comprising - conveyor means for conveying the mould drum between the production device and the mould member cleaning device.