Things You'll Need
2 soft, non-abrasive cloths or towels
Non-abrasive cleanser, such as Bar Keeper's Friend or Earth Friendly's Creamy Cleanser
Your dishes, bowls and mugs can accumulate metal marks from your silverware. Each time you stir your coffee or other liquid in your mug with a spoon, small metal marks are left on the mug's surface. The metal marks are black or gray in color, and dishwashing liquid alone won't remove the marks. You need a substance that can break up the mark without damaging the mug's surface.
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Wipe the mug with a soft non-abrasive cloth or towel to remove any loose dust or dirt from the mug's surface.
Apply 1 tbsp. of a non-abrasive cleanser to a soft non-abrasive cloth or towel.
Rub the non-abrasive cleanser onto the metal marks on the mug. Let the non-abrasive cleanser sit for one minute.
Remove the non-abrasive cleanser from the mug with the non-abrasive cloth or towel.
Fill a sink with warm water. Add a tablespoon of dishwashing liquid to the water.
Wash the mug in the soapy water.
Rinse the mug with warm water. Dry the mug with a clean non-abrasive cloth or towel.
Repeat steps for other mugs with metal marks.
Wear latex gloves if you don't want to get your hands wet.