Sutra Neti is a Hatha yoga technique to clean your nasal cavity. Sutra Neti is one of the six methods of purification or Shatkarma as given in the yogic text Hatha Yoga Pradeepika. There are various types of Neti practiced by Yogis including Jala Neti (with water), Dughda Neti (with Milk), Sutra Neti (with cotton string), etc. In Sutra Neti, a waxed cotton string is traditionally used to clean the nasal cavity.