1. Soak the pork belly in cold water for about 20 minutes to remove impurities floating on the pork belly. \x0d\2. Turn the pork belly over and use scissors to remove the fat on it. Then take an appropriate amount of alkaline surface and rub it on both sides repeatedly. The alkali surface must be applied evenly! Rub for about three minutes and rinse with water. (The alkali surface can be replaced by alum)\x0d\3. Use coarse salt and flour to smear the pork belly again, and rub it repeatedly. The flour can take away the dirt on the pork belly, and the particles of coarse salt can inhibit this effect. After about two or three minutes, rinse with water. \x0d\4. Finally, rub the pork belly with white vinegar or rice vinegar for about three minutes. A clean piece of pork belly with no peculiar smell will appear in front of you. \x0d\5. At this time, boil the water in the pot, put the pork belly in and cook for about three minutes, remove it, and use a knife or scissors to scrape off the remaining white fat on the pork belly again.