If the inner cannula is designed for reuse, clean it in a solution of equal parts hydrogen peroxide and 0.9% sodium chloride. Wear sterile gloves and maintain aseptic technique. Remove encrusted secretions from the lumen of a metal tube with sterile pipe cleaners or a soft sterile brush. For a plastic tube, use only sterile pipe cleaners to prevent damage by a brush. After cleaning, thoroughly rinse the inner cannula with 0.9% sodium chloride solution.