How can I effectively clean a stainless steel coffee mug to keep it looking shiny and spotless?

To effectively clean a stainless steel coffee mug and keep it shiny and spotless, use a mixture of warm water and mild dish soap to wash the mug. Scrub gently with a soft sponge or cloth, then rinse thoroughly and dry with a clean towel to prevent water spots. For tough stains or spots, you can also use a mixture of baking soda and water to scrub the mug. Avoid using abrasive cleaners or scrubbers that can scratch the stainless steel surface.