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How to clean a dull stainless steel sink
Choose a moderate abrasive.
Abrasives can scratch your sink's finish, so use them only for an occasional restoration project, or to remove stubborn stains. Try stainless steel polish, whiting, talc, or baking soda.

pick from the following. [+] If your sink is severely dirty, consider using a mild cleaner instead. Steel pulls away dust from the finish, so use it sparingly on the stainless steel.; [+] Apply one of these to a slightly damp cloth. Rub in the direction of the finish lines.; [+] These can be found in the cleaners section of most grocery stores, or you can purchase them directly from the bottle. Rinse off the polish with cool running water.; [+] Avoid those with zinc, as they're more likely to scratch your stainless steel. Line the sink's rim with aluminum foil or newspapers to make cleaning easier.;
Apply one of these to a slightly damp cloth. Rub in the direction of the finish lines.