Second, prepare clean and soft towels.

3. Dip the towel into the rice washing water, and then clean the inner wall of the purple casserole.

4. Then take out the towel and soak the purple casserole in rice washing water for more than 5 hours.

5. Brush the inside of the purple casserole with a toothbrush after soaking.

6. Pour in water and rinse off.