How To Clean Rusty Grill Grates With Baking Soda And Vinegar. Add this mixture to the bag and seal the bag tightly. Allow it to soak for one hour and use the brush to scrub away the loosened rust.
Allow the bag to sit overnight to allow time for the residues to loosen from the grates. Apply the paste on the grates with the help of a scouring pad or an old toothbrush.
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Apply the paste to the grill using a sponge, and let it sit for about 20 to 30 minutes. As the baking soda bubbles, it will lift the rust.