Abstract: It is disclosed a system for dispensing a cleaning fluid into a toilet bowl adapted to receive a flushing liquid from a tank. The system includes a cleaning fluid container positioned outside the tank and a valve controlling fluid passage from the container into a flushing liquid filling the tank at a varying level. The valve has a closed state and an open state blocking and enabling, respectively, fluid passage thereof. The valve switches between the states by the varying level. A conduit communicates the container with the valve, receives the cleaning fluid from the container, and releases it to the flushing liquid through the valve. A bottle base is attached to the tank for receiving a mouth end of a dispenser bottle. The dispenser bottle has a diaphragm for sealing the dispenser bottle and a punching pin punches the diaphragm while the dispenser bottle is brought into the bottle base. Thus, the pin enables a flow of a cleaning fluid out of the dispenser bottle.