Please choose the correct solution to the question: how to get rid of yellow stains

Solution1: 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.

Solution2: 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 format: solution1/solution2
Answer: solution2