In everyday life, the nasal cavity generally doesn't require special cleaning, as it has a natural self-cleaning function. The inside of the nasal cavity is lined with cilia that constantly move to clear out dust and debris. Additionally, the nasal vestibule is equipped with nasal hairs that block larger dust particles from entering the respiratory tract. Mucus and other secretions also help to remove impurities from the nasal passages, keeping the nasal cavity clean. Therefore, under normal circumstances, there is no need to deliberately clean the nasal cavity.

However, in certain situations, some intervention may be necessary. For example, if you have nasal vestibulitis or if a large amount of crust has formed in the nasal cavity, or if the air is heavily polluted, extremely dry, or if you have been exposed to irritating chemical gases, the nasal vestibule might develop crusts. In such cases, simple remedies can be used to alleviate the condition.

Medical experts recommend using saline or plant-based oils to clean nasal crusts. Plant oils, such as sterilized cooking oils, can be effective, especially if they have been boiled and cooled to a neutral temperature. Ointments can also be applied to soften and remove the crusts.

Additionally, due to environmental pollution and dry air, particularly in winter, the nasal cavity's self-cleaning function may weaken. In such cases, nasal irrigation can be considered. Various isotonic nasal rinses are available on the market, which can assist in cleansing the nasal passages. For children, using a spray-type rinse is safer to avoid the risk of water entering the airway.

Overall, while the nasal cavity doesn't typically require special cleaning, appropriate care in specific situations can effectively maintain nasal health.