The just moving ash can be a problem, somewhere on here is a diagram of the air flow through a St. Croix stove and it points out the area that gives the most trouble. Once you get this area clean you can keep it clean with a very strong shop vacuum by using it instead of a leaf blower, a leaf blower will usually just suck what ever is in there out if you leave it running long enough and go poking in all of the clean out ports and thump on the walls. Most of us will say to do a normal clean out before using the blower. Some stoves have a very simple air path and the blower alone will clean most of the ash in the system out (provided it isn't in big sticky clumps). When I use it on my stove my ash traps are empty afterwards. Since I can see up into the heat exchanger area I always hit that with the scrapper, a vacuum nozzle, and a putty knife. I can go quite awhile before I feel I need to remove my ash trap covers and attack things from that side. If you watch the burn you can tell when it is getting to the time to clean a bit more.