This keeps the glass clean!
We use special heat-resistant glass. We have also made an “air spoiler” above each glass. The air flows naturally into the stove and part of it flows into the fireplace through the air gap above the glass. This creates a layer of air in front of the window, which ensures that the glass remains clean.
We recommend using dry untreated wood (max 20% moisture) and no paper during lighting. All this ensures clean windows.
If the glass do turn black, special window cleaners are available in most DIY stores. The disadvantage is that the windows often get greasy.
But we also have another tip!
Take a piece of kitchen paper, wet it a bit and dab it in the stove ashes. Use this to clean the windows. Afterwards, dry the glass with a dry piece of kitchen paper. Works perfectly!