A sinus rinse is a method used to clear nasal passages and sinuses of mucus, allergens, and irritants. It typically involves using a saline solution, which is a mixture of salt and water, to flush out the nasal cavities. This process can help relieve symptoms of conditions like allergies, sinusitis, and colds. The rinse can be performed using various devices, such as a neti pot, squeeze bottle, or syringe. Regular sinus rinsing may improve breathing and overall sinus health, making it a popular practice among those with chronic nasal issues.