toothpaste and a fine soft brush
Soft tooth brush and warm soapy water
Hot water - drop of Dish wash soap. Steep in let cool and use toothbrush to clean. Rinse and dry........
You can invest in the new sonic jewelry cleaners and let them do the magic or just gently brush with a soft bristled toothbrush after allowing the jewelry to soak in a steamy brew of hot water mixed w/a squirt of dish soap ( Dawn preferred ;) )