Go to a beauty supply store and by cream peroxide at 30-40% volume. If the item stained china is small, you can immerse the item in the cream peroxide for a day. If the stain is on a larger piece of china, you can apply the cream directly to the stain, reapply as needed over the course of a day or two. In both cases, once the stain is removed from the china, hand wash the china is warm water with a gentle cleaner. Once the cream is completely removed from the chine, soak the china in water for quite a day or so. This will ensure that all of the cream is removed from the china and that none remains in cracks.