1. First, use a harder brush to brush off the sand on the inner and outer walls of the casserole to avoid falling into the food;

2. Secondly, Fill the casserole with water and leave it for about 3 to 5 minutes;

3. Finally, rinse it with water and set aside. Of course, we need to remind everyone here: the soaking time should not be too long, and the water outside the casserole must be wiped dry before use.