A wall dryer vent needs to be cleaned at least once a year, but many people are unaware of how easy it can be to clean a wall vent. Unless your wall dryer vent goes on for 10 feet or more, cleaning it is easy.
Disconnect the dryer hose from the vent and move the dryer out of the way. Clean around the vent opening and, if you know how, open the back of the dryer and clean the lint from there as well. Use a dryer vent cleaning tool that you can buy at any hardware or home improvement store, to clean the vent by simply inserting the cleaning tool into the vent and then removing it. Clean the vent exhaust on the outer portion of your wall by hand but be sure to wear a pair of work gloves.