The answer to 'best way to clean air duct' is to have your air ducts professionally cleaned every 3-5 years. Professional duct cleaning services use specialized equipment and techniques to thoroughly remove built-up dust, debris, and contaminants from your home's ductwork. This helps improve indoor air quality, increase HVAC efficiency, and extend the lifespan of your heating and cooling system.
DIY duct cleaning is generally not recommended, as it can be difficult to access all areas of the ductwork and remove deep-seated buildup. Professional cleaners have the tools and expertise to clean your ducts safely and effectively without damaging the system.