If there are scratches on the glaze of the casserole, you can simply grind it with sandpaper, but don't grind it too hard.

Extended data:

Casserole is a kind of cooker. Traditional casserole is a ceramic product made of raw materials that are not easy to transfer heat, such as seasonable, feldspar and clay.

Casserole is fired at high temperature, which has the characteristics of ventilation, adsorption, uniform heat transfer and slow heat dissipation. The recipes that depend on casserole include casserole chicken, casserole tofu, casserole fish head and so on.