Product review (5 stars): Truly amazing!
I just happened across this looking at the Whirpool community and I am glad I did. Although I had replaced my dryer vent a number of years ago, I did not want to go in the crawl space to do it again. I used this from outside and it did an amazing job just using the dryer blower on air cycle. The instructions state that the preferred method is to disconnect the dryer and connect your shop vac inside while using this device from outside. Since I just installed a new dryer and cleaned the interior portion by hand, that was too much trouble. It worked perfectly well with my method and I was careful to not use enough extensions to get the brush into the dryer fan. I am now inclined to use this a couple of times a year rather than every two years as recommended by Whirlpool.