Cleaning a fishy frying pan

I know there are some friends who will wonder how you can possibly clean a cast iron fry pan after you've fried fish in it. Of course, with cast iron, you never use soap. But you can get it clean. I just add some hot water and let it soak for a few minutes, and then I scrub it with a stiff dishwashing brush. I rinse it and pour the pan almost dry. Here's the good part. I throw in a tablespoon of baking soda and then scrub the pan again and let it soak for a few more minutes. The baking soda acts like an abrasive and it also removes any odors. I dry it with a paper towel, add a teaspoon of oil and rub it in. In five minutes the pan is like new!