After the cast iron cookware has cooled down, grab a handful of kosher salt and a rag to scrub away the gunk, then rinse with warm water.
Dry the cookware piece immediately and season it with oil. Usually, a tablespoon of oil is enough to coat the cookware without it dripping.
By no means necessary should you ever soak your cast iron skillet in water. You should also refrain yourself from placing your cast iron skillet in the dishwasher, using strong detergents, or metal scrubbing pads because you will run the risk of rusting your skillet and removing the seasoning.