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If it is Black stainless, I have heard this happening many times as the finish is just a coating. Over time it seems to peel off. If it’s stainless steel, they use an outer coating as well to keep it fingerprint-resistant. Anything other than soap and water will eventually, on some models, cause it to peel. Unfortunately, there is no recourse to reverse it other than replace a door, etc. If the item is under warranty, they will replace the part under the cosmetic warranty. If the item is not, it’s an unfortunate battle with the manufacturer. Sometimes they will send a tech out to determine if it’s a factory defect or use and care. -Al
