Things You'll Need
Instructions
Place the porcelain pieces you are cleaning in a plastic storage container that is large enough to accommodate a platter. You can clean several items in one container if they are small (like tea cups), but don't place platters on top of each other in one container.
Put on protective gloves. Fill the container, or each container, with 40-percent hydrogen peroxide. Use one 32-ounce bottle per container. Make sure the items you are cleaning are completely submerged in the peroxide.
Place the lid securely over the container and allow the porcelain to soak in the peroxide. This can be a lengthy process; the porcelain may need to soak for several months to remove all the trapped grease that accumulates from long use. Check the peroxide periodically to make sure it is still clear and strong. When it becomes discolored, and/or develops an unpleasant smell, replace it.
Remove the porcelain after it is cleaned to your satisfaction and thoroughly cleanse it with soap and warm water to ensure that every trace of peroxide is gone.