You bought a clay casserole. Here you can see how to prepare casserole before cooking. You made the dish in a casserole by looking at the recipes. It’s time to clean the casserole.

Do not use soap or detergent. Clean with hot water only. Burnt-like black spots may appear on the upper sides of the casserole where the water from the food splashed. You can remove these areas like strings with a hard material without pressing. I tried a diaper and it didn’t remove it. You can remove it with a steel wool without applying too much pressure. If you don’t remove it, a slightly burning smell may linger on your next meal.

Hot water flowing from the tap is actually enough, but if you want it to come out thoroughly, boil some water, swish it around, then clean it and rinse it with hot water.