I have a dryer leaving clothes damp, and would be thrilled if someone could explain the way to clean the attic vented duct. The following picture is the duct that I think is the dryer, but the rectangle box is strange to me, after the rise it goes up and through the roof. The rectangle end is sealed with a white mastic like substance. Any help is appreciated.
https://photos.app.goo.gl/5KH65y6vh7IonTyu1
https://photos.app.goo.gl/5KH65y6vh7IonTyu1
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