Tried this the other day and it did wonders!

To clean your  jewelry using Nana’s method, start by gathering the necessary materials. Fill a small bowl with warm water and add a few drops of mild dish soap. Submerge the jewelry in the solution and let it soak for about 10-15 minutes. After soaking, use a soft toothbrush to gently scrub the jewelry, paying attention to intricate details and crevices. Rinse the jewelry under warm running water and pat dry with a soft cloth. For extra shine, you can buff the jewelry with a microfiber cloth.