I have gone through a total of 2 tons and I'm down to my last 15 bags......I clean my stove on a regular basis every week getting every nook and cranny that can possibly be cleaned inside without pulling out the stove on rails and getting more indepth. But unfortunately I have yet to clean my exhaust liner, I know I heard in here some people say you should do the leaf blower trick every ton, but due to the crazy winter we have been having with the temps and snow I haven't gotten around to it. Is it that bad to stretch it a bit more till some decent weather comes around? What do you guys have to say about this subject?