How To Clean Cast Iron Grill Grates With Vinegar And Baking Soda. Add the resulting solution to an empty, clean spray bottle. After 10 minutes, take a sponge or steel wool and scrub the grates.
Another cleaning solution you can use is to mix four cups of water to one cup of apple cider vinegar. Apparently kosher salt is also a mild abrasive like baking soda that works great on removing rust.
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Apply it to the rusty area, then use steel wool or a wire brush. Apply the paste to rusty spots and wait for 30 minutes.