1. Wipe it with low-concentration soapy water and lukewarm water, or gently rub it with proper amount of toothpaste, then rinse it with clear water, take it out, absorb the water with flannel or napkin, and dry it in a cool and ventilated place. Cars had better use some dry wax or spray wax. 2. Use mineral water instead of tap water to clean pearl necklaces, because tap water contains hypochlorous acid, which tends to blacken pearls. It is best to clean with mild mineral water, dry with a soft cloth, and don't move. Remember to wash it after each wear, because pearls are delicate jewels, and it is easy to lose their luster if they are worn and kept improperly. Don't wear perfume, hair gel or sunscreen after wearing pearls. These chemicals will seriously harm pearls:) Love your pearls, and they will return with luster ~