If you have noticed that your dryer just isn’t drying the same way it use to, try cleaning the dryer vent duct.  If the dryer vent duct has not been cleaned and has heavy lint build-up that could be effecting the dryer.  You should clean you dryer vent duct every year.  Not only will this help your dryer run at its peak but it will also help to prevent a leading cause of house fires.  Dryer vent fires account for over 15,000 house fires each year.  70% of these could have been avoided by simple maintenance of the dryer vent. 

For more information: http://www.usfa.fema.gov/downloads/pdf/tfrs/v7i1.pdf