Have you ever been camping, and after cooking over a campfire, had to scrub the soot off of the outside of a cooking vesel? It can be a royal pain. Here's a trick to make removing the soot super easy.
Purchase a bar of Ivory, or some other pure soap, no perfumes or creams, or other such nonsense, simply pure soap. Use the soap like a crayon, and completely cover the outside of the cooking vessel. When the meal is over, and it's time to wash the dishes, & pots"n pans, the soot will stick to the soap, and when it is easily washed off, the soot goes with it.
Learned that trick back in 1966, in Boy Scouts. We had an amazing troop-master. He taught us so many great things.
Caution: Avoid getting any soap inside the pot. It's just not good seasoning for food. If you do get any in the food pot, you can use that food to wash out your child's mouth when they say something inappropriate.
Seeeeeeya; Chief Longwind of the North