This could be caused by melted synthetic fibers, rust from old water, laundry product residues -- you name it. But what makes dirty iron plates even more annoying is the fact that those dark marks ...

Cover the iron plate with the baking soda paste ... Use it alone if your iron shows signs of corrosion, such as rust stains, ...

It may sound like when rust strikes, it's the end of the road for your favorite cast iron skillet, but it's not. Restoring an even a vintage cast iron pan is easier than you might think ...