The main thing is scrubbing. The first shell should be cleaned. Generally, the body shell of shrimp should be scrubbed with waste toothbrushes and running water (flowing water). If you do it at home, you can consider cutting off the extra feet except the two tongs of shrimp, and then you must pay attention to cutting off the front third of the shrimp head with scissors (you can cut it from the front of the shrimp head at an angle of about 40 degrees) to wash off the dirty head. The most important thing is to wash the gills, just like removing the gills of fish. Turn the shells on both sides of the head slightly to remove the gills, or clean them (mainly by washing them in white), then pump off the shrimp intestines at the tail, rinse them with clear water and a little vinegar until there is no fishy smell, and then you can cook in the pot! Add more garlic and onion ginger, it will be more flavorful if you add some rice wine.