Sterling silver naturally oxidizes over time. It can be removed with a metal polish & polishing cloth, or DIY at home remedy:
Add a half cup of vinegar to a clean container. Then, add two tablespoons of baking soda
Place your jewelry in the solution and let it sit for two or three hours
Finally, rinse the jewelry with clean water and wipe dry with a clean cloth
Add a few drops of dishwashing liquid to a bowl filled with two cups of lukewarm water
- Put your gold pieces into the solution and let them soak for about 15 minutes or longer to break down the dirt
- Lift jewelry out of the solution and gently scrub with a soft-bristle toothbrush to remove any dirt lodged in nooks and crannies.