How to clean platinum?
Platinum doesn’t tarnish, fade, or change color like many metals used in fine jewelry. However, its patina can dullen due to exposure to environmental components. This causes the platinum jewelry to lose its shine.
To restore its sheen, soak in a gentle warm solution of soap and water. After 15 minutes, rub your piece gently with a soft brush. Rinse under warm water and wipe with a soft cloth to dry.
It is useful to note that platinum can take on a natural soft patina due to age. This will look different from the original shiny polish. If you would like the new look, bring your piece to a jeweler for polishing so the soft patina can shine better