prepare salt water (put two spoonfuls of salt in a 1ml bottle and dilute it with boiling water). The ratio of salt to water is 1: 1. Don't let the water temperature exceed 3 degrees. Go to a drugstore to buy a test tube, or roll a cotton ball with a toothpick and dip it in salt water to wash your nostrils. Xd \ Leave the cotton wool in your nostrils temporarily. At this time, you may lean your head up or lie flat, press the sides of your nose with your index finger and thumb, and suck it hard to make the cotton wool. \xd\ At first, I feel unbearable pungent in my nose, so I can get used to it several times, or I can wash it with light salt water and gradually thicken it to make my nose adapt slowly. Stick to washing your nose once in the morning and once in the evening.