Abstract: The present invention is a permanently installed automatic kitchen ventilation degreasing system. The system includes a cascading cleaning mechanism and drainage mechanism. A water feed tube carries water and cleaning agents to a conduit secured and centered within the ventilation ducts. The water and cleaning agents are sprayed in a cascading manner along the inner surface of the duct by spray nozzles located on nozzle blocks spaced at intervals along the conduit. The flow of solvent or rinse water through the nozzles is controlled by solenoid valves which are controlled by a programmable controller. The liquid run off is collected by a deflector and drained.