He said it works well, and that he can clean hundreds of pieces of flatware in an evening. Have not seen it first-hand, so can't comment personally. It does work, but you might as well take the item and rub it on a concrete sidewalk, it will work as well, and is equally as abrasive. Also, if you own a steel wire brush, throw it away. I have seen many great lanterns and locks ruined by using this technique.
Nothing beats non-abrasive cleaners, soft cloths and tons and tons of elbow grease.
It will work on china, but probably very slowly. Oversoaking a piece will tend to weaken it. The product is additive-free, and can be purchased through industrial supply companies. While this is not as powerful as clorox, it won't contaminate the china. I have saved that posting to my FAQ file.