Abstract: A machine comprising a trough with pipe pieces provided one at each end thereof for the purpose of accommodating wheeled trolleys carrying the containers. A tubular frame with nozzles is positioned over the trough and is adapted to move axially therealong. The frame is arranged to communicate with the source of the washing medium for the purpose of delivering the washing medium to the nozzles. The trough consists of a stationary bottom member and side flaps mounted adjacent thereto. A drive is arranged to open said flaps during the washing process and close them after the washing to permit the container to be moved in the trough. The machine is simple in construction and can be readily fitted to a pneumatic conveyance pipeline handling domestic refuse and other loads contaminating the conveyance containers.