A long time ago I heard to allow iron to cool, dampen (wet and wring out) a washcloth and use sodium bicarbonate. Over the years it has worked for me. Sometimes I needed more of the paste than others. Once I needed the assistance of an old toothbrush. But it's good to know about all these other things if I need it. Thank you. I will share this website as it is about baking sode also.
http://www.cancerfungus.com/ My family says it was used to be added to bath water and foot soaks and compresses.