You must remove chrome or stainless steel oven racks before running a high-heat self-cleaning cycle because temperatures exceeding 800 degrees Fahrenheit will permanently ruin the metal. The extreme thermal stress destroys the protective nickel or chrome electroplated coating, causing the steel to warp, discolor into a dull chalky gray, and lose its smooth finish. Furthermore, the heat strips away the specialized graphite lubrication on the rack glide rails. You can troubleshoot rack protection easily. You can verify that your corrective action is successful when taking the racks out beforehand preserves their structural integrity, keeping them flat, shiny, and sliding smoothly inside the oven cavity.
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