Cast Iron Skillet Recipes: How to Care for Cast Iron
To rid of rust stains, rub this handy rust eraser (pictured) on the stain, and then reseason pan. Find it at hardware stores, bike shops, or wood-working shops.
To clean, use a stiff brush or plastic scrubber under running water while the cast iron is still warm but cool enough to handle with ease. Kosher salt is also a good scrubbing agent for baked-on stains. The most important tip is to never use soap!
Before cooking, apply vegetable oil to the cooking surface, and preheat the pan on low heat, increasing the temperature slowly.
Never marinate in cast iron. Acidic mixtures will damage the seasoning. Reseason if food particles start to stick, rust appears, or you experience a metallic taste.