Had my chimney swept by a service. The chimney sweep told us that we had some glazing. He said he could not remove it ! I read on another thread that lead me to the chimney sweeps web page he states that if use us these creosote removers that you spray onto the wood before and during a fire, it will begin to chemically turn the glaze into flakes which then can be removed with a brushing. Anyone have any experience with this ?