For the Experienced (or Determined) Cleaner
Older pieces which have surface cracks that have yellowed can be made to appear less unattractive by lightening the stained areas. Most often, the yellowing in the cracks, grooves and manufacturer marks are the result of microscoping food particles. To successfully clean it requires the use of a cleaner that attacks the organic matter and removes it. For the average collector, that requires a hydrogen peroxide-based cleaner.
OxyClean can be used to lighten, lift and even remove organic stains on Carr China. I have made a strong bath to soak pieces in by putting stained dishes in a 5-gallon bucket, adding 2-3 cups of powdered OxyClean and then filling it up with hot water. Leave it in a place where you'll forget about it for a few days (the longer the better - it won't harm your dishes!). You'll see amazing results!
Hydrogen Peroxide of at least 30% strength can also be used. You can purchase it by the gallon at a beauty supply store in a stronger strength than you may find at your local grocery, drug or mass retailer.
Bath Method: One way to use hydrogen peroxide is to make a full-strength bath. Completely cover the stained dish with hydrogen peroxide in an open container (never sealed!) and leave it to soak for a few days. Follow this with the heat process explained below. Please take care to put your bath out of the reach of children or pets, as hydrogen peroxide is a dangerous chemical!
Wrap Method: You can also soak cotton strips in hydrogen peroxide and completely wrap your piece with these strips, followed by plastic wrap. After a few days, unwrap the piece. You will see the cotton has absorbed the yellowish looking organic matter from the piece. You may need to repeat this process a few times until the cotton no longer turns yellow. Follow this with the heat process explained below.
Heat Process: Once you have completed the bath or wrap method, you must expose the piece to heat to complete the process. You can simply place the item in the sun, or in the oven at 150 degrees for about an hour. The heat forces out the remaining organic matter, as well as rids the piece of remaining chemical residue. The item must completely dry out to avoid damage to any surface upon which it is placed.
Please take care when working with this caustic chemical, which can be explosive if not handled properly. Rubber gloves are a must and it is recommended you cover all surfaces with plastic or newspaper to minimize damage from spills. To learn more, please buy and read Ms. Wilby's book.
