Pour water into a microwave-safe mug or bowl. Heat in the microwave for 1 to 2 minutes.
Line the bottom of a cereal bowl with aluminum foil. Pour hot water into the bowl. Add salt, baking soda, and dish detergent; do not stir. Place jewelry on top of foil. Let soak for 5 to 10 minutes.
Rinse jewelry in cool water and dry well with a soft cloth.
