Method 1: put a proper amount of detergent or jewelry cleaning agent in warm water, then put the gold necklace in, soak it for three to five minutes, then gently brush off the stains on the necklace with a soft brush, and finally rinse off the residual stains and reagents on the necklace with clear water;

Method 2: Send the gold necklace to optical shops, jewelry stores and other places with ultrasonic cleaning equipment, and let others help you with ultrasonic cleaning. For necklaces inlaid with gems, carefully check whether the gems are loose before ultrasonic cleaning. If the gem is loose, it should be reinforced before ultrasonic cleaning.