It works!
We have two large panes of glass in our Quadrafire fireplace.  I have tried other products that took too much effort to remove deposits on the inside of the glass.  This Rutland product just melts the material producing a perfectly clear glass surface.  I use it the day after each fire because it is fast and easy.  I put a quarter-sized dollop on a quarter sheet of paper towel, coat the surface and rub it off.  I use another half sheet to buff to crystal clear finish.  Just bought two more bottles.
Rating: 5 stars