Naclerio method of nasal washing. A) A volunteer's head is tilted back 30° from the vertical and a syringe containing 5 ml of 0.9% sodium chloride is inserted into one of the nasal spaces. The volunteer briefly holds their breath while the 5 ml is expelled into the nasal space. B) Following a count of ten the volunteer leans forward and blows the fluid gently through the nares and into a Petri dish. The procedure is repeated with the other naris and the contents pooled.