What is the best way to: how to get rid of yellow stains

Choices: a. mix cup salt and 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 cup salt and cup baking soda with 1 gallon water in a large cooking pot. Add the yellowed items and boil for 1 hour..
Answer:
b.