White streaks in the nose are usually mucus secreted by the nasal mucosa and cannot be completely removed.
Nasal mucosa contains mucous glands, the secretion produced can form mucous phlegm on the surface of the nasal cavity, the main components of which are inorganic salts, mucopolysaccharides, mucin, lysozyme, IgA and water, nasal secretions contained in the lysozyme, interferon, SIgA and so on contribute to the cleansing effect of the nasal cavity.
Smaller dust particles inhaled into the nasal cavity can be partially settled with the turbulence of the airflow, or with the laminar flow dispersed in the mucus blanket on the surface of the nasal mucosa of the area of a wider range; some of the water-soluble particles can be dissolved, and can not be dissolved, such as dust particles and bacteria, with the movement of the cilia to reach the posterior nostrils, into the pharyngeal cavity, was spit out or swallowed.
White strips in the nose is the mucus in the nasal cavity water evaporation is too fast, not in time with the cilia swing and discharge to the nasopharynx and the formation of dry scabs, can be patchy or stripes. It is reasonable to use warm saline to rinse the nasal cavity or to spray the nose with physiological seawater nasal spray to assist in cleaning the nasal cavity, but it cannot completely remove the white streaks from the nose.
In case of doubt or discomfort, consult an ear, nose and throat specialist at a hospital.