Heat tarnish needs a bit of extra attention to restore your piece to its original gleam, but the discoloration will come off with little effort in most cases.
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Moisten a microfiber cloth with white vinegar.
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Wipe the heat-tarnished stainless steel with the vinegar-moistened cloth, adding more vinegar as needed. You should not need to rub very hard.
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Rinse the stainless steel well to remove the vinegar residue.
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Scrub the stainless steel gently with a nonabrasive cleanser, such as Comet NA, Soft Scrub or Earth Friendly Creamy Cleanser, and a sponge if any heat tarnish remains after treating it with vinegar. Rinse well.