A nasal wash is a tool for cleaning the nasal passages by putting in saline before rinsing. To use the nasal washer, you need to fill the nasal washer with saline first, insert the rinse head into the nostril to be rinsed, lower your head and open your mouth, breathe normally, and flow the saline into the nasal cavity so that the rinsed saline will flow out of the mouth and the other nasal cavity. To flush the left nostril, lean to the right so that the saline will flow out of the right side of the nose. Similarly, when flushing the right nostril, the body needs to be tilted to the left. Be careful not to use too much force or pressure to avoid mucosal damage. At the same time, the water temperature needs to be adjusted to the right temperature to avoid nasal discomfort. When there is a need to use nasal washers, it is recommended to strictly follow the instructions to avoid adverse consequences.