Most people scrub the pig's belly with salt, and the effect is not particularly good. If you use some vinegar in the cleaning process, the effect will be better. Because through the action of salt and vinegar, you can remove part of the dirty smell in your stomach and the mucus on your epidermis. This is because vinegar makes collagen discolored and coagulated; Salt has a high osmotic pressure. Collagen can be separated from the stomach wall by the action of salt and vinegar, thus removing dirt and odor. After cleaning, put your stomach in cold water and scrape off the calluses at the tip of your stomach with a knife. Be sure not to use alkali when washing your stomach, because alkali is very corrosive. Under the action of clothes, the mucus on the belly surface will fall off, destroying the protein on the belly wall and reducing the nutritional components of the belly. To remove the dirt and fishy smell on the pig's belly, first wipe the pig's belly with flour, put it in clear water to wash away the dirty mucus, then put it in a boiling water pot until the white umbilical skin is taken out, then put it in cold water, and scrape off the dirt on the white umbilical with a knife. After washing the outside, cut it from the head of the stomach (the thick part of the meat) to remove the oil stains on the inner wall, and then rub the stomach with a small amount of vinegar and salt to remove the shy smell. Finally, rinse with clear water until there is no greasy feeling, then put it in a pot and cook it until it is cooked.