Raw Potato and Baking Soda to clean rust off cast iron

So why did I abruptly stop posting three months ago?

Because my new found freedom was abruptly stopped, that's why; The place I had just moved into, burned down.

Luckily, most of my stuff was spared; Not all of it.  

My cast iron cookware was all spared.  However, between being randomly sprayed by fire hoses, and then  thrown into storage immediately before the place was bulldozed, some of my cast iron now has rust that needs to be cleaned off.

I was told that rust can be cleaned off cast iron, using baking soda and a raw potato.

So I tried that with the 9 quart pot.  I sprinkled baking soda in it, a little bit of hot water, and scrubbed with a raw potato cut in half.

It didn't take much scrubbing, and the rust spots came right off.  It works!