The answer to 'best way to clean air duct' is to hire a professional air duct cleaning service. Air ducts can accumulate dust, dirt, and other debris over time, which can reduce air flow and indoor air quality. Professional air duct cleaning services have the specialized equipment and expertise to thoroughly clean your air ducts, removing built-up contaminants and improving the efficiency of your HVAC system.
Most experts recommend having your air ducts cleaned every 3-5 years, or more frequently if you have pets, smoke indoors, or have recently completed a home renovation project. The process typically involves using high-powered vacuums and brushes to dislodge and remove debris from the ductwork, followed by a thorough cleaning of the air vents and registers.