Product review (5 stars): Excellent Dryer Duct Cleaning tool - A must have
This worked well for me.  I have a washer dryer setup that is located in the center of the basement. In other words, a long runt to the outside.  I also have several 90-degree turns until I get to the straight run portion (roughly 16').  Not wanting to force things I worked my scenario from both ends (inside out, and outside in).  I pulled a lot of lint out of the dryer vent ducting.  Even though I had installed smooth pipe it still accumulates lint.  I saw in some other review recommending to tape the joints.  After using the Deflecto Dryer Duct Cleaning kit the only tape I recommend using is to tape the head (brush) on with some painter's tape (this is what I used).  Otherwise, the other joints are extremely tight after using my dill to gently turn the brush clockwise as stated,  Do NOT go counter clockwise as you will most likely loose the brush in the ducting.  Also, gently work the brush adding extensions one at a time as they are flexible to get around corners in your duct work, but also flexible enough to twist back on themselves if you have too many and are using a drill to turn things. I bought the Gardus 12' extension kit as well for my long run.  Good product that worked well for me!