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Keep deposits from building up
Dirty glass is often caused by the fuel you are burning or the way the air controls are set. Clean deposits before they build up and become harder to remove. Use a cleaner approved for your stove glass on a cold pane, following its instructions. Let the glass dry completely before lighting the stove.
Brown deposits and poor combustion
Baked-on brown deposits can include creosote from incomplete combustion. Wet wood and prolonged slumber burning can contribute to this build-up. Persistent deposits are a reason to have the flue system checked: creosote can lead to chimney fires and blockages.
Soot at the end of a burn
Some stoves leave a light coating of dry soot as the fire dies down. You may notice it when you come to light the stove the next day. As the firebox cools, the airwash becomes less effective and soot can settle on the glass.
This deposit is usually easy to wipe away. Follow the glass manufacturer's cleaning advice; avoid abrasive cleaners and improvised scrubbing materials.
Choose dry, suitable fuel
Burn suitable seasoned wood with a moisture content of 20% or less. A moisture meter lets you check this; appearance and sound alone cannot reliably confirm how dry a log is. The Ready to Burn mark identifies wood certified to a moisture content of 20% or less. You still need to use the fuel and air settings specified for your stove.
Read HETAS guidance on seasoning firewood.
Use the airwash correctly
Do not turn the air controls down so far that the logs are left smouldering. Follow your stove handbook for the correct primary and secondary air settings. The airwash needs the operating conditions specified for that model to help keep the glass clean.
If you use a stove thermometer, follow its fitting instructions and the appliance manufacturer's guidance rather than relying on a universal temperature threshold.
Position logs carefully
Avoid placing the ends of logs towards the glass. Use a heat-resistant gauntlet to place them carefully, following the loading instructions for your stove. While the firebox is warming up, deposits can settle on the cooler pane and bake onto it as the temperature rises.
Clean this staining once the glass is cold, before lighting the stove again.
Further guidance is available from Woodsure and the Stove Industry Alliance.