2. First, turn out the inner wall of the pig's small intestine with chopsticks, then hold the pig's small intestine with one hand and two fingers of the other hand to squeeze out the dirty things on the inner wall of the pig's small intestine from top to bottom.
3. After treating the dirty things on the inner wall of the small intestine, drop a few drops of cooking oil, and then rub it with your hands until a yellow liquid is kneaded.
4. Finally, add proper amount of vinegar, cooking wine, sweet potato powder (or flour is also acceptable), and wash the pig's small intestine by hand, usually two or three times, and the pig's small intestine will be very clean.