The answer to 'how to clean ductwork' is to regularly clean your home's ductwork to improve air quality, energy efficiency, and the lifespan of your HVAC system. Ductwork should be professionally cleaned every 3-5 years, or more frequently if you have pets, smoke indoors, or notice visible dust buildup.
Start by turning off your HVAC system and covering any vents or registers to prevent dust from circulating. Use a vacuum with a long hose attachment to remove loose debris, then use a duct cleaning tool or air whip to dislodge and suction out any built-up grime. Be sure to clean the entire length of the ductwork, including bends and connections. Finish by wiping down the vents and registers with a microfiber cloth.