2. Add proper amount of baking soda and salt to rub the inner wall of the intestine with gloves. There are many bubbles in about five minutes, and rinse with water.
3. Repeat this twice.
4. Continue to wash the inner wall of the intestine with salt and white vinegar, and repeat it twice, and rinse it with water.
5. Turn the intestine over, cut off the fat oil with scissors, rub it with salt and vinegar once, and rinse it with water.
6. Turn over and expose the inner wall of the intestine.