Proper cleaning of a dryer vent includes cleaning out the lint trap, disconnecting the dryer vent hose and using brushes and a vacuum to clean out the vent. The exterior vent should also be brushed and vacuumed for complete cleaning.
The first step to properly cleaning out a dryer vent is removing the lint trap and thoroughly cleaning it with a fine-bristle brush. Next, use a long, flexible brush to clean out the lint trap housing cavity. Finish up by vacuuming out the inside of the cavity.
Unplug the dryer and disconnect the duct joints at both ends of the vent hose. Insert a duct brush with a flexible shaft into one end of the hose. Rotate the brush to clean out the hose. Continue sweeping out the interior, removing the lint from the brush periodically. Repeat this procedure for the duct elbows. Once done with the brushing, use the vacuum to remove any lingering lint.
Use the vacuum to suction off any lint on the back of the dryer and the wall behind it. Put the dryer vent back together and plug the dryer back in. Find the exterior dryer vent, remove the external screen and use a brush to remove any lint or other debris. Vacuum out the interior of the vent and replace the screen.