Product review (5 stars): This did an amazing job cleaning the exhaust vent for my dryer
This did an amazing job cleaning the exhaust vent for my dryer.  I started one the inside and ended up going in from the outside as well.  Remeber to tape the joints to ensure they stay together.  I used painters tape so it was easy to take off.  Also, don't force the brush as you clean, let the brush do the work.