This company sells a do it yourself dryer vent cleaning kit. All you need is a shop vac and drill. It costs $39.95, click on the video below to see how it works. The equipment that the pros use are slightly more expensive this one is call the Vac Brush
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Carpet Cleaning Prescott Arizona 
twincitiesfurnacecleaning said
Interesting little gaget. Think I’ll have to check it out and see if it really works this well. Amazed to see how well it worked on the coiled ducts. Thanks.
greencarpetcleaning said
I think it would probably work for a do it yourself home owner but not sure if it would stand up to every day use for a contractor.