Cleaning the glass in your wood stove or fireplace is fairly easy. Especially if do regularly. An old trick that works well.... Spray your glass cleaner onto crumpled up newspaper. Then dip the wet newspaper into the fireplace ashes, making a paste. Wipe the paste with the newspaper onto the dirty glass in a circular motion removing the built up soot. The spray the glass cleaner directly onto the glass and wipe off. Repeat if needed.