At All Natural Services, we clean the dryer vent with a rotating brush. Our process uses the exclusive Duct Scrubber, this process involves feeding a rotating brush through the dryer vent. There are several types of brushes that will break up any blockage that it encounters. During this process the rotating brushes thoroughly clean all sides of the dryer vent.
If your clothes are still damp at the end of the drying cycle, most likely there is a clog or excessive build up like the picture below:
Reasons to Clean your Dryer Vent