No, it is not advisable to wash cast iron cookware while it is hot. Cast iron retains heat very well, and if you try to wash it while it is hot, you run the risk of burning yourself or causing water to splatter and potentially cause injury.
To clean cast iron properly, it is recommended to wait until it has cooled down to a safe temperature. After it has cooled, you can use warm water and a gentle scrub brush or sponge to clean it. Avoid using harsh soaps or abrasive materials, as they can damage the seasoned surface of the cast iron.
If you have stubborn food residue stuck to the surface, you can add some kosher salt and scrub it gently with a damp cloth or sponge. After cleaning, make sure to dry the cast iron thoroughly to prevent rust. You can place it over low heat on the stove or in the oven for a few minutes to evaporate any remaining moisture, and then apply a thin layer of oil to season the cast iron and protect it from rusting.
Remember, always prioritize safety when handling hot cookware and allow it to cool down before attempting to clean it.