Some Brushes can be employed which has a drill, as demonstrated while in the Photograph over, to make sure that whilst These are shifting it in the vent hose, the brush can also be rotating rapidly to dislodge any caught-on particles. A trick we use, is using a small number https://www.google.com/maps/d/edit?mid=1zd0d3IPdS64YAAjQgqfwsbTmTTNGA7U&usp=sharing