I can't get a brush through to the fireplace from the top. There is
some kind of ledge, and I can't get my arm up through the fireplace
either. DO I need to clean that part? Where does all the creosote build
up? At the top, it looks almost clean, less than 1/4" of loose dry
build-up. But its hard to see down very far, and I can't see anything
of the ledge.