Start with an empty sink and disposal turned off. Run a full stream of hot water for 1 minute. Reduce water flow to a thin stream into side of sink. Insert one Foaming Power Pack completely into disposal. (Do not open pack.) Start cleaning by turning on disposal. Foam may rise into sink, or into both sinks if a double sink. Lasts 1 to 2 minutes. Turn off disposal when foam completely retreats into disposal. Rinse remaining foam from sides of sink. Seal the bag after each use.