You'd be better off to remove the dryer to clean out the vent for two reasons. First, you'll have to break the seal and reseal the exterior vent cover. Second, the interior case of the dyer fills with lint. I had to replace the high-limit switch on the dryer this year and while I had the dryer apart I cleaned out enough lint to build a small blanket. Granted the dryer had not been cleaned for four years, but now it's on a yearly schedule.