After you have applied the Advance cleaner Bausch & Lomb Boston, the Bausch & Lomb Boston Solution turn. This moisten and disinfect your hard gas permeable contact lenses overnight. It provides excellent protection against harmful microorganisms to give your eyes rest. Use: Wash your hands every night with mild soap, rub for 20 seconds each side of the lens 2 to 4 drops of Boston Advance Cleaner in the palm of your hand. Then rinse the lenses thoroughly with tap water. Place the lenses in the lens holder and fill it with the Boston Solution.