The answer to 'my air duct cleaning is filthy' is that your air ducts likely need professional cleaning. Over time, dust, dirt, and other debris can accumulate in your air ducts, reducing air flow and air quality in your home. Common causes include lack of regular maintenance, pets, and construction or renovation work.
Signs your air ducts need cleaning include visible dust or debris coming from vents, unpleasant odors, and reduced airflow. While you can try some DIY cleaning methods like vacuuming accessible areas, a professional air duct cleaning service is recommended to thoroughly clean the entire ductwork system and ensure all contaminants are removed.