A friend of mine is having trouble with a Huntsman Model 241, the smoke is backing up and he needs a way to clean the inside which is believed to be clogged. The pipes have all been swept but there was no good way to access the top side of the stove where the smoke jogs back and forth before leaving the stove itself. Does anyone have any prior experience or possible idea's to clean this out. The home was recently purchased and this is his first use, no prior information on the condition of the stove or if ever maintained.