Check the water dispenser to see whether it is double-temperature or single-temperature, ordinary water dispenser or direct-heating water dispenser, and check the surface of the water dispenser for damage, cracks, scratches, paint peeling and water leakage. If you encounter the above problems, tell the customer in advance to avoid unnecessary disputes, and check whether the water dispenser works normally and whether there is any problem with heating and cooling. After the inspection, start cleaning. First, turn off the switch of the water dispenser and unplug the power cord. Then take down the bucket and move the water dispenser to a place close to the water source (such as kitchen, bathroom, balcony). Take off the smart seat of the water dispenser, pour out the water inside, then put it on the mat cloth, and use a cup to discharge all the remaining water inside the water dispenser (front hot and cold water nozzle, back drain valve, two drain valves behind the dual-temperature water dispenser). After putting all the water into the measuring cup, check how much water is released from the inside of the water dispenser and how much scale is. According to the amount of discharged water and scale, add the scale remover of Nantong Xinjiexin water dispenser according to the ratio of 11-51g per liter of water (pour out the water in the measuring cup and add the same amount of warm water), then stir it evenly, pour it into the water dispenser (when adding water, pay attention to turn off the drain valve at the back of the water dispenser to avoid the added water flowing off), then plug in the power supply of the water dispenser, and turn on the hot water switch (not the cold water switch) of the water dispenser for heating and soaking for 5 minutes after boiling.