Just in case anyone needs any encouragement to not put off cleaning out your dryer vent, here's a before and after. You can see the "plug" that had probably 70-80% blocked the vent. This was after the first round of "scrubbing" from the far side but before the leaf blower and using the brush again from this end. Not sure but I think that orange color in the 2nd pic is just the flashlight reflecting off the inside of the tube joint.
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