1. Pressure cooker steam flushing method. Boil the cold water in the pressure cooker, take the lower pressure valve when continuously discharging steam, open the range hood, and aim the steam water column at the rotating fan blades. As high-temperature steam continuously rushes into the blades and other parts, oily sewage will flow into the waste oil cup along the way until there is no oil in the oil cup ... 2. Soaking with detergent and vinegar. Remove the oil smoke extraction impeller, soak it in warm pot water mixed with 3-5 drops of detergent and 50 ml of vinegar for 10-20 minutes, and then scrub it with a clean rag. The shell and other parts are also cleaned with this solution. This method has no damage to human skin and no corrosion to equipment, and the surface still maintains its original luster after cleaning. 3. Soap surface coating method. Make soap into paste, and then smear it on the surface of impeller and other devices. After the range hood is used for a period of time, remove the impeller and other devices, wipe it with a rag, and the oil will fall off ... The range hood should pay attention to the usual maintenance. When you finish the last dish, don't turn off the switch immediately, and let the range hood exhaust the remaining oil and gas as much as possible. Wipe the surface of the range hood after turning off the switch. At this time, the oil and gas is still hot, and it is the easiest to clean .. If you use a turbine range hood, you can spray the kitchen oil cleaner into the range hood. After the cleaner works, turn on the switch of the range hood, and the softened oil will be removed by centrifugal force .. If you use an oil screen range hood, you must remove the oil screen, soak it in hot alkaline water or degrease it, and then clean it. ..