1. First wash it with clean water, put dishwashing liquid and white vinegar in the casserole and apply it evenly with a cloth, then wash it with clean water and dry it.

2. Next, apply rice soup, add a spoonful of rice and water to boil, spread the rice soup around the pot and let it sit for half an hour.

3. Finally, cover the pot, leave it overnight, clean it with a cloth, brush a layer of base oil in the pot, cover the pot and leave it overnight.