I am looking for suggestions on cleaning a 4" rigid dryer vent from folks that have cleaned them themselves. My dryer is taking forever to dry clothes and I suspect it is due to lint accumulation in the dryer vent system. I am planning on purchasing a dryer vent cleaning kit and was wondering if anyone has any recommendations based on actual use. For my purpose, I will need a brush with about 15' worth of extensions to be able to run the full length. Any product suggestions? Any cleaning tips?