Lydia, I was one of the folks who suggested you use baking soda on your previous thread, glad you did it. Is there any evidence of rusting of the metal, now that you have removed the baking soda? If so, you may want to treat the metal with something.
I play with old cars that have rusted areas and I use a couple of products. One is Ospho, available in quarts for about $ 7 at hardware stores and Home Depot. It kills the rust and seals it somewhat. Another product is a Rust Converter spray, it chemically changes rust (iron oxide) into iron tannate, a more stable material. It will turn black on you, and you can put several coats on it to complete the transformation.
It sells for about $12 at auto parts stores and here is one I use, made by CRC. If you let it dry for a few days, you can put the mat back in and the rust will not come back or cause any more problems.
And here is the Ospho: (Use a throwaway brush to apply it liberally to the rusted areas)
Oh, wear rubber or vinyl gloves with either product. The Ospho is acid based and the CRC will stain your fingers black for a week or so. (I learned that one the hard way)
If it is rusted, you need to kill the rust or it will continue to eat at the metal, like Cancer.
Don
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