Discovery Bay Dryer Vent Cleaning Wizard is the best way to eliminate a fire hazard and improve dryer performance. A certified dryer exhaust technician will also clean the interior of the clothes dryer chassis and inspect the belts and rollers for wear. Worn belts can cause the drum to become unbalanced and rub against other parts, causing the dryer to throw sparks which can easily ignite lint that is built up in the dryer vent system.