To clean a stainless steel coffee mug, place 2 tablespoons baking soda in the mug, along with a generous amount of household vinegar. Shake a few times, rinse thoroughly with warm water, and let the mug air dry before use.Continue Reading
Pour 2 tablespoons of baking soda into the mug, then add a generous amount of whatever vinegar you have on hand. The mixture bubbles up as you add the vinegar to the baking soda, so leave enough room in the mug to allow for shaking.
Seal the mug tightly with the lid so the vinegar and baking soda don't leak out. Shake the mug well at least a few times to get the inside surface and bottom of the lid clean. Scrub the mug with a bottle brush to break-up any grime left behind by coffee, if necessary.
Open the stainless steel mug, and rinse it thoroughly with warm water to remove the baking soda and vinegar. Once the mug is clean, let it air dry in a well-ventilated area on a drying rack or clean towel.