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How do I prepare the cartons to be used for soap molds?

pick from the following. *Cut the top off of the empty carton and wash thoroughly with warm water. Place open end down on paper towels to dry. *Cut the top off of the full carton and wash thoroughly with warm water. Place open end down on paper towels to dry.
Cut the top off of the empty carton and wash thoroughly with warm water. Place open end down on paper towels to dry.