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Mix soap and water with ammonia. Scrub your jade gently. Use a toothpick to carefully pick out debris.

Article:
Dilute a small amount of ammonia in your solution if you need to remove more stubborn grime. Combine eight parts water, one part soap, and one part ammonia, then mix the solution until it’s fully dissolved.  If you’re cleaning a piece of jewelry, make sure ammonia won’t harm its other gems or metals. Be sure to know that your jade has not been treated. Cleaning jade that has been treated with ammonia can cause damage to its appearance. Use your soft brush or microfiber towel to gently scrub your jade piece. Remember to use small, circular motions. Rinse your piece under warm water after scrubbing if you’ve successfully removed the grime. Sometimes debris or mineral deposits can accumulate in small crevices. If you have trouble flushing them out with a cleaning solution or toothbrush, try to carefully pick them out using a toothpick. Go slowly and take care not to damage any settings or prongs.