Things You'll Need
If you regularly drink coffee, it's not uncommon to have rings of coffee form underneath the cup as the coffee occasionally runs down the side. If you left your coffee cup in your stainless steel sink, these rings can form stains that are difficult to remove with regular cleaners. While you may have a number of powerful household cleaners to choose from, some of them may be damage or dull your stainless steel. For most stainless steel stains, including coffee stains, a little white vinegar mixed with a few other common household items will work wonders.
Mix baking soda and white vinegar in a small container. The two chemicals will react when you combine them. Use mostly baking soda, and add vinegar until the solution is a thick paste.
Apply the paste to the coffee stain and let it sit there for about 15 minutes.
Pour a little white vinegar on a cloth and wipe up the paste, scrubbing over the stained area. Rinse the area with water.
Use a clean cloth to dry the area. The stain should be either gone, or barely visible.
Pour some club soda on a cloth and wipe down the entire sink area, not just the coffee stained area. This will return some of the luster to the entire sink. Dry the area with a clean cloth.