Dryer vent cleaning is a service that should be included with each and every whole home air duct cleaning service. The company that is there providing the service was hired to clean the ductwork in the home, and the duct that leads from the back of your dryer to the outside of your home is typically one of the dirtiest. When cleaning a dryer vent the technician should first check inside the dryer where the lint trap is and using a long, thin brush clean under the lint trap. Then turn the dryer on and check the connections in the back of the dryer to make sure none of the dryer exhaust leaks into your home. Then begin the actual dryer vent cleaning by running a brush (with little metal burrs on the edges to scratch the inside of the duct) through the duct cleaning it from the outside to make sure that all of that lint stays out of your home. This brush is attached to Revolution rods that run from the outside of the vent all the way back to the back of your dryer polishing each inch of the dryer vent itself. This process may need to be repeated several times to assure a clean dryer vent. Finally the technician should confirm the air is flowing like it should be out of the back of the dryer all the way through the duct out of your home.