Product review (2 stars): Getting this cleaner past the 90 was easy enough but there was no way this could have ...
Our dryer duct makes a 90 as soon as it enters the wall.  Getting this cleaner past the 90 was easy enough but there was no way this could have been used with a drill.  The rod was wanting to twist, not the brush, when trying to turn by hand.  A drill would have destroyed the rods.