I had one of my "grill lifters" (not sure what else to call it) fall down into the grill and sat in water for a long, long period of time. When I cleaned the grill and found it this is what it looked like:
I figured this would be a good time to experiment first hand on with the ELECTROLYSIS method of cleaning metal.
This what I did. I took a small bucket and screwed an old lawn mower blade to the side of the bucket and hung the rusted metal by an insulated wire from a paint stick over the bucket.
I then took an old coat hanger and wrapped the rusted metal with it insuring good contact with the metal. Then I took a battery charger and connected the positive end (red) to the lawnmower blade. Then the negative (black) to the coat hanger which was wrapping the rusted metal. I also poured in a small dash of baking soda (secret ingredient) to facilitate the chemical reaction.
After a period of time the rust leaves the rusted metal object and begins to stick to the lawnmower blade and the top of the water is full of rust sledge.
After many hours pull out the metal object and brush with a wire brush. Mine looked like this:
I cleaned it up a bit and sprayed it with heat resistant black grill paint:
I hope I've explained this procedure in the most general easiest terms. I think I also have an idea for my kid's next science project.