1. Component: The main component of physiological saline is sodium chloride with a concentration of 0.9%. Nasal washing salt is a kind of salt preparation containing many ingredients, including sodium chloride, sodium nitrite, borax and so on.

2. Usage: Normal saline is mainly used to clean nose, which can clean nasal mucosa, reduce secretion accumulation, diminish inflammation and sterilize. Nasal washing salt is usually a commodity used to make nasal washing agent, which can be prepared by adding distilled water or other ingredients in a certain proportion.

3. Applicable people: Normal saline is suitable for all people, especially those with severe nasal infection. Different products can be selected according to different people's needs.

In a word, using physiological saline to clean the nose is the best choice, because it has wide applicability and safety. If you need a more powerful nasal wash, you can consider using a doctor's prescription saline or professional nasal wash salt products, but please follow the doctor's advice and instructions.