If you cook with cast iron you know it is a great kitchen tool. Here is how I wash my cast iron pans.
My mom prepared almost all of our meals in a large cast iron pan. She never ever used soap. She was from the school of thought that iron absorbs flavors, hence the reason for seasoning cast iron cookware.
I have two cast iron pieces that are seasoned and I follow my momma's rule. Here is how our family cleans cast iron cookware. First off, I would never wash cast iron in the dishwasher. Cast iron needs to be hand washed.
Here is what I do. When I am done cooking in a cast iron pan, I immediately put enough hot water to cover the stuck on food left from cooking. I then set it back on the stove burner and bring to a simmer and turn off the flame. I do this right after I plate up what we are having and let the pan soak while we are eating dinner.
When I go to do dishes, the cast iron skillet is ready for washing. To wash, all I do is take my plastic dish washing brush and brush off the food under hot running water. When the pan looks clean, I dry with a paper towel or lint free dish cloth. The pan may have a slight amount of oil on it still. This is normal. The seasoning builds up in the oil and that oil coating keeps your cast iron from rusting.
The slight amount of oil on the cast iron skillet or cookware will not become rancid and you heat cast iron up to a high temp before cooking in the next time anyway. Now if you really have something stuck on the pan you can use some salt to clean cast iron. Just sprinkle and scrub with your kitchen brush. This will not ruin the seasoning of your cast iron cookware.