Doesn't do the job
I have a wood stove with glass in the door. It sort of cleans the glass if it's only gotten a haze from a half day of burning wood. Spent 10 minutes and could hardly tell the difference. If the buildup gets dark or dried out from a hot fire, it's totally inadequate. Much quicker and less mess to use a razor blade.
Slow, messy and seems to never get the glass. I can clean the glass in 2 minutes with a razor blade and the results are better than spending 30 minutes of spraying and wiping with this stuff.