1. Wash your hands. Before you start, use soap and warm water to avoid causing unnecessary nasal infections. 2. Make a mild salt water solution. Mix 1 to 2 tablespoons of salt into a few cups of warm water. It is not necessary to follow a strict ratio, as long as the salt is not excessive and does not irritate the nose. Why choose salt water rather than ordinary water? Because salt water is weakly acidic and can act as an antibacterial agent while moisturizing the mucous membrane of the nasal cavity. So cleansing the nasal passages achieves two purposes: flushing out any obstructive dirt and neutralizing any residual bacteria. Use filtered or distilled water. The purer the water. The better the saline solution that is made. If you feel unsure, you can boil the water first. The sensitive mucous membranes in the nose are especially susceptible to infections, such as medulla obliterans. Heat the water to the proper temperature. Both too cold and too hot can be uncomfortable for the nose; a warm level is optimal. Use salt that does not contain anti-platelet agents, not table salt (which can be arbitrary). If you wash your nose frequently, then you can try not using table salt with additives. Table salt contains antiplatelet agents as well as other additives. 3. Instill salt water into the nasal cavity. There are two methods. You can choose according to your personal needs. Inhale the saline. Scoop some salt water with the palm of your hand, bend down in front of the sink, face down, and inhale the solution into your nostrils. It will feel a little weird, but the solution will flow out the back of your nose, not through your throat, and into your lungs. Use a nasal rinse. Fill the rinse with salt water, then bend over in front of the water plant, face down, turn your head sideways and use the rinse to introduce the salt water into the top of your nostrils and out the bottom of your nostrils. 4. Calm down! Flushing your nostrils can feel a little weird, but don’t panic, as long as you bend down there’s no problem. Breathe through your mouth during the process of washing your nose. This will not feel like you are about to suffocate. 5, repeat irrigation two or three times a week. Regular nasal cleansing can relieve habitual nasal congestion and reduce the dependence of nasal allergy-prone people on steroid-based nasal sprays.