Question: how to get rid of yellow stains

  Options: 
 A. mix ¼ cup salt and ¼ cup baking soda with 1 gallon water in a large cooking pot. Add the yellowed items and freeze in a deep freezer for 1 hour.
 B. mix ¼ cup salt and ¼ cup baking soda with 1 gallon water in a large cooking pot. Add the yellowed items and boil for 1 hour.
Answer: B