I was searching info about installing a fireplace insert in my fireplace and was reading about the flexible chimney liners. The liner I was looking at reminded me of an oversize dryer vent hose for a clothes dryer. Does any one have experience with these and how do you clean the soot and creosote build up out of the inside of them when needed. It looked like what I need to what I need to do. Just do not want to spend the money if it is more problem than it is worth.