Salt Scrub to clean cast iron. Here's the best way to clean cast iron: Scrub it with coarse salt and a soft sponge. The salt, a natural abrasive, absorbs oil and lifts away bits of food while preserving the pan's seasoning. Rinse away salt and wipe dry.
No more scouring pots and pans! Just mix together 2 parts baking soda with 1 part peroxide (it will make a paste) and rub the area with a dish rag until clean. Fun Home Things: Tip of the Week--DIY Pot and Pan Cleaner