Nasal irrigation or nasal lavage or nasal douche is the personal hygiene practice in which the nasal cavity is washed to flush out excess mucus and debris from the nose and sinuses. The practice is generally well-tolerated and reported to be beneficial with only minor side effects. Nasal irrigation in a wider sense can also refer to the use of saline nasal spray or nebulizers to moisten the mucous membranes.
Process :-
A simple method requiring no specialized equipment is to snort water from cupped hands, but this clears little more than the nostrils. The application of commercially available saline nasal spray is another simple alternative, but it is relatively inefficient for washing away debris, although it may suffice for simple rehydration of mucous and tissues.
A simple yet effective technique is to pour salt water solution into one nostril and let it run out through the other while the mouth is kept open to breathe, using gravity as an aid. Jala-neti, which means to cleanse the nose with water, is an old yogic technique from India. The container used to administer the saline is called a "neti pot". Neti is Sanskrit for "nasal cleansing". A second neti technique known as sutra neti uses a piece of string instead of water.