Product review (5 stars): Works Very Well, But You Must Follow Directions Exactly
My dryer vents are very long and were clogged all the way through. I figured I would have to replace the vent since it was so full of lint. I tried this product on a whim, just to see if I could save the time and money of replacing the vent. I'm glad to say that this was the best $26 (and change) that I've ever spent on ANYTHING. This product WORKS! But you must follow the directions TO THE LETTER otherwise it will not work and cause you a lot of grief and aggrevation.

The trick (as detailed in the directions) is to duct tape each of the extenders when you're adding them on. NEVER run your drill counter-clockwise, and go VERY slowly. If you think you can put all four extenders on and shove this in your vent and clean it in one shot - think again. Go SLOW and EASY. Take your time. The lint will come out. It's real simple to determine when you've reached a point of blockage. The extender will start to bend. Twist the brush for a couple of seconds, then pull it out (keep the drill on - let it do the work). Then put it back in, and repeat for as long as it takes.

You will need a 3/8" or larger drill. A smaller drill won't work. I highly suggest a variable speed drill, as most of the time you want to go slow at first until you're certain the blockage has been removed, then you can go ahead and turn it on all the way.

But be VERY careful, especially if there is a bend in the vent pipe. The extenders can twist on you and it will break if you are not careful. But by following the directions, taking your time, and going slow and easy - this product does work, it will clean the vent and you'll save your self a lot of time and money by doing the work yourself and not hiring anybody to do the work or replacing clogged vent pipe.

A suggestion is to have a second person help you steady the extenders while inserting and removing them from the vent, especially when the vent pipe has bends in it. But if the pipe is straight and short, a single person can do it by themselves. Start with one extender, then work up to two, then three, and if needed, all four. But like I said above - do NOT use all four at once to start with. It simply will NOT work.

Bottom line - Follow the directions, duct tape the extenders together when needed, and take your time. It works!