You will need:

• 1 tablespoon salt

• 1 tablespoon of baking soda

• 1 tablespoon of dishwashing detergent

• 1 cup of water

• 1 piece of aluminum foil

purification stages:

1. Heat water in microwave for 1 or 2 minutes.
2. Cut a piece of aluminum foil and place on the bottom of a small bowl or cup.
3. Pour the hot water into the bowl. Add salt, baking soda and dishwashing liquid. Put jewelry on the foil and leave for 5-10 minutes.
   Rinse the jewelry with cool water and wipe dry with a soft cloth.

A source
https://www.pinterest.com/pin/137078382386279213/