Cleaning of containers

New containers only shall be used unless bottle washing equipment of the type used in carbonated beverage plants is used, making it possible to soak the bottles in a solution containing three and one-half per cent alkali, of which sixty per cent shall be caustic (sodium hydroxide), for a period of at least five minutes at 120°F. and then rinsed in potable water. New containers shall be rinsed with hot water.