To clean a dryer duct, unplug the dryer's electric cord. If it is a gas dryer, do not attempt to disconnect the gas line. Next, pull an electric dryer out away from the wall, or pull a gas dryer as far as the gas line allows. Unfasten the metal tubing from the dryer and the wall, and use a vent brush by rotating it to remove accumulated lint.
When cleaning the dryer duct, it is good practice to clean the filter and the trap as well. To begin, remove any lint from the lint screen; odor-ridden screens may need soaking in hot, soapy water for 10 to 15 minutes. Use a coil brush to clean the lint trap and use a vacuum to pick up any dirt or lint that the brush has loosened.
In addition to the filter and dryer duct, it is also necessary to clean the house-vent opening. Use a vent brush to remove any blockages from both directions, from the inside, as well as from outside of the house. Most dryer ducts should be cleaned at least twice a year. The dryer duct may need cleaning when the top surface of the dryer gets hot when it is in use, or if it takes longer to dry cloth than usual.