Last year was my first year burning a clydesdale insert and I have to say I was not happy. It was suggested that the wood I was burning was not seasoned and after seeing what came out of the chimney I am a believer. I still can't see how wet wood burned so fast in the thing but it was definitely wet. As far as the cleaning goes, I made my own rods out of 1/2 inch pvc in 5 ft lengths. I am concerned about how far I was able to get the brush down the chimney though. The actual masonry chimney houses two pipes, one to my insert and one to the oil burner. The insert liner turns slightly to one side and down before it connects to the insert. I would say I was able to get the brush to the bend and that was it. That would leave the first 2 or 3 feet just out of the fire box untouched. I 'm not sure if commercial rods would make the bend either but is this something that should worry me? I am under the impression that the creasote build up is toward the top of the chimney anyway, correct? As the smoke rises and cools. I'm thinking about trying one of those creasote remover products just for an extra measure. Do they work? Thanks in advance.