. "you can easily clean your 22k gold jewellery by washing it with warm water or soapy water and dry it with a soft cloth , you can use unused toothbrush to remove some residual material in soapy water.and its not advisable using and chemical cleaner such as bleach with your any type of gold as it may oxidize and turn to black color , if you try to clean and fail just ask a trusted jewellery to clean" . . .