1. First find a pair of scissors and cut off the fat on the outside of the intestines. If you don't have scissors, you can scrape it off with a boning knife or tear it with your hands.

2. After removing the fat, fill the large intestine with water first. Then find a chopstick, push the outer skin inward from the opening of the intestine, and turn the inside of the intestine to the outside.

3. Then add some flour and salt to the basin, add a little water, and scrub the pig's large intestine repeatedly until a large amount of glue is produced. Then rinse with clean water. If you don’t have flour, cornstarch for cooking will also work, but if you don’t have any, just use table salt.

4. Then add cooking wine or white vinegar with a little water, scrub it once, and finally rinse it.