A receptacle for receiving cleaning concentrate, the receptacle comprising a concentrate discharge and a container having an opening, wherein a block-shaped cleaning agent is disposed on the opening in a replaceable manner, a liquid supply which is arranged for a washing out action, wherein liquid is sprayed through the opening onto the cleaning agent in order to wash out the cleaning agent and to form a cleaning concentrate, wherein a valve is provided in the concentrate discharge, which valve is controlled by a control device, wherein the control device is arranged to keep the valve closed during the washing out action, and wherein the device further comprises a signal supplier which is arranged to give a first warning signal after a predetermined phase of the washing out action.