How to Clean Air Ducts After Pest Activity

Ductwork acts as the lungs of your home, and discovering signs of pests inside them is a major health concern. Once you have successfully removed the animals and sealed the entry points, the remaining nests, droppings, and shed fur need to be addressed immediately to ensure your air quality is safe and your system runs efficiently. Cleaning ducts after an infestation is a process of systematic removal and decontamination. Doing this well means going beyond a simple wipe-down; it requires reaching into the accessible trunk lines to pull out debris, sanitizing the interior surfaces, and verifying that no remnants remain to circulate through your rooms.

1. Lock in the dust. Use painter's tape and plastic sheeting to seal all supply and return registers throughout the house. This prevents debris from blowing into your living spaces during the cleaning process.
2. Uncover the entry points. Unscrew each supply and return register cover from the walls or ceilings. Place them in a bucket of hot, soapy water to soak while you work on the ducts.
3. Remove the nests. Reach into the accessible duct openings to pull out large nesting materials, droppings, or dead pests by hand. Wear long sleeves, a N95 respirator, and thick rubber gloves for your own protection.
4. Capture the fine dust. Use a shop vacuum equipped with a HEPA filter to clean the interior of the ductwork as far as the hose will reach. Move slowly to ensure the vacuum picks up fine dust and dander.
5. Kill what's left. Mist a mild, HVAC-safe antimicrobial solution onto the interior surfaces of the ductwork using a pump sprayer. Allow it to air dry completely before turning your HVAC system back on.
6. Seal the final defense. Install a new, high-quality pleated air filter in your air handler. The old filter will contain high concentrations of pest dander and must be disposed of immediately.