Shopvac or regular vacuum cleaner?

Does the dryer vent through the wall or does it vent through the roof? If it vents through the wall, jest get a new mylar vent hose and clean the outside vent. If it vents through the roof, the best way is to take the vent pipe apart in the attic (provided there is room), and clean from above and below until the line is clean. Then, go up to the vent cap and pull and clean the vent cap and screen Usually best to clean from below the roof.