Dryer vent cleaning, attic discharge. Inspected dryer exhaust vent inside, in the attic and on the roof. Rooftop Cap exhaust is heavily impacted and clogged. Roof pitch is too steep to climb and remove by hand. Inspected with camera and found most of vent to be about 29% clogged and the majority at the cap. Used spinning brush to break impacted portions and removed lint from exhaust with 3 passes. Vacuumed excess debris and gave customer tips on ways to prevent the exhaust from getting as clogged in the future.