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In case of chronic rhinosinusitis, it is necessary to perform a local treatment by daily nasal washes with physiological serum followed by a spray of local corticosteroids. This treatment is essential and cannot be substituted for any other treatment. It allows by cleaning the nasal mucosa of accumulated secretions, dust and allergens, to decongest the nasal mucosa and to bring a lot of respiratory comfort to the patient. Precise explanations on the realization of the nasal wash which is a real nasal shower are given. The aim of the treatment is to clean the nasal mucosa and to allow the nasal corticosteroids to treat the mucosa. This is a prolonged treatment that the patient must follow every day for years, or often even for life.