I've seen some people asking questions about cleaning these stoves and the links to USSC video for cleaning. While the video give you some basics I think it wise to take an extra step or two. Here's a pic of my 6039, with the agitator, firepot and fake firebrick removed. A. Those are slots that go behind the wall of the stove. A wire or better yet a small but long bottle brush will get a lot of junk out if you clean that area. That area that you can get to from the slots run all the way from top to bottom of the stove. B.. Those are the 1 1/2" knockout plugs. Those should be in place behind the fake firebrick. If not go buy some and put them in when the stove is running. Pull them out while cleaning and you will be able to get around the back of the stove. I use a good stiff, large bottle brush and a semi-stiff piece of wire. I use the wire to reach down and around E, the fresh air intake pipe. A lot of stuff will build up around that pipe, you will have to try and scrap it to either of the D vertical clean outs. Ash will also build up on top of C the fuel auger tube, you can knock it down with either a brush or the wire. C. Fuel auger tube. D. Ash clean outs. Remove those covers and you will be able to vacuum out any ash that falls from cleaning behind that wall from brushing. E. Fresh Air Pipe. And then the two heat exchangers. A small bottle brush and wire will get a lot of ash from behind those and the side walls of the stove. Here's an attachment that can be enlarged to see better.