Dryer vent cleaning, attic discharge. Dryer exhaust vent is 20 feet going from downstairs through attic and out a steep pitched roof between hip joints. Spoke with homeowner and they have had an issue with dryer vent building up water and needing to be cleaned often. After inspecting inside, outside, in the attic, and with inspection camera, discovered that the dryer vent is impacted at most of the turns, and very thickly impacted at the exhaust point on the steep roof. Unable to gain access to the rooftop due to pitch, and unable to clean by hand from attic side due to the height in the attic. After using spinning brush to thoroughly clean other joints and punch through several openings in the exhaust vent, I was able to clear 90% of the lint from the vent. The only remaining lint is the impacted portions at the rooftop exhaust. Shorten dryer exhaust hose and reattached everything after cleaning the surrounding areas. Breaker head flipped for the dryer before my arrival so I turned it