Ceramic glass
The heat-resistant glass used in stove doors and ceramic hobs. Chemically robust and thermally tough, but readily scratched, and scratches are permanent.
What not to do
Steel wool is unsafe on Ceramic glass
Unsafe
Do not do this. The risk is established, and it is described below.
Evidence
Supported
Sources
Glass Technical Paper FB01-00: Proper Procedures for Cleaning Architectural Glass Products
National Glass Association (NGA) with the International Window Cleaning Association (IWCA), 2023 · Trade or professional body
Relied on for: That abrasive cleaning materials are ruled out on glass and that metal contact with the glass surface is to be avoided. (states this directly)
Precautions
- Do not apply to a hot surface
- Check the manufacturer's instructions
In detail
The transparent panel in a wood-burning stove door and the flat top of a ceramic hob are glass-ceramic: a material processed so that it has a very low thermal expansion coefficient and can take rapid, uneven heating without cracking. For cleaning purposes it behaves as a hard, non-porous, chemically resistant surface, which is why it tolerates treatments that would damage most of the appliance around it. Its real vulnerability is mechanical. The surface scratches, scratches do not heal, and on a stove door they collect soot in a way that makes the glass progressively harder to keep clear. That is the reason abrasive choice matters more here than chemical choice, and the reason a fine powder that stays suspended in water behaves very differently from a scouring pad. One caveat is not about the glass at all: where a panel carries screen-printed decoration or a printed border, an abrasive that does not mark the glass will still abrade the print, which is why at least one stove manufacturer restricts its own mildly abrasive cleaner to plain-glass doors.
Properties
Sensitivity
- Acids
- Not known
- Alkalis
- Not known
- Heat
- Not applicable
- Abrasion
- Sensitive
- Porous
- Not applicable
“Not known” means nobody has established this, not that the material is unaffected.
What works
Wood ash is safe on, in specific conditions, Ceramic glass
Safe only in specific conditions
This is only appropriate within specific limits. Outside those limits, no claim is made.
Only within these limits:
- The glass must be cool to the touch — never clean hot glass
- Fine ash only, from clean untreated wood, with no coarse remnants or clinker
- Applied on damp paper or cloth, worked gently
- Not on printed or screen-printed glass — check the manufacturer's instructions
- Keep cleaning material away from the rope seal around the glass
The cool-glass requirement is about thermal shock and about burns, and both sources state it before anything else.
Precautions
- Do not apply to a hot surface
- Wear gloves
- Check the manufacturer's instructions
- Test on an inconspicuous area first
Evidence
Supported
Sources
Top tips for keeping your stove glass clean
HETAS Limited, United Kingdom · Trade or professional body
Relied on for: That newspaper dipped in water and cool stove ash clears stove glass, that the glass must be cool to the touch first, and that care is needed not to scratch it with large remnants from the ash. (states this directly)
How to clean wood burner glass
Charnwood (A J Wells & Sons Limited) · Manufacturer documentation
Relied on for: That the manufacturer recommends damp paper dipped in fine wood ash, requires the glass to be cool, and warns that water on hot glass could crack or shatter it. (states this directly)
Wood burning stove door glass — cleaning tips
Stovax & Gazco (Stovax Heating Group) · Manufacturer documentation
Relied on for: That a different manufacturer restricts mildly abrasive cleaning to plain glass and directs owners of printed glass elsewhere, and that cleaning fluid must not reach the rope seal. (states this directly)
Hacks and claims involving this
- Ash and water on stove glass Supported
- Steel wool for stubborn marks on stainless steel Does not work
- Newspaper for cleaning glass Established practitioner practice
- Using a dishwasher tablet outside the dishwasher Unresolved
- Steam cleaning sanitises without chemicals Unresolved
- Scraping glass clean with a razor blade Does not work
- Alcohol cleaners are gentle, so they are safe Disputed
Where the sources disagree
Stove glass guidance prohibits abrasive cleaners and recommends ash, which is an abrasive. Which applies?
The two statements use the word 'abrasive' to mean different things, and once that is seen the contradiction disappears. The prohibition is about materials harder than the glass — grit-loaded scouring creams, metal and nylon scouring pads, blades and scrapers — which cut the surface. The recommendation is about a specific powder that is softer than glass-ceramic and harder than baked carbon, which is the exact relationship that lets an abrasive remove a deposit without marking what is underneath. HETAS makes the boundary explicit in the same article by warning separately against large remnants in the ash: coarse unburnt fragments are the hard particles the prohibition is about, and they arrive mixed into the very material being recommended.
What to do: Use fine ash, sieved or taken from the fine layer rather than scooped with clinker in it, on cool glass, and stop if you feel grit. The prohibition on abrasives is not overridden by the ash technique — it is the reason the ash has to be fine.
The sources are answering different questions
Sources for this page
Sources
Wood burning stove door glass — cleaning tips
Stovax & Gazco (Stovax Heating Group) · Manufacturer documentation
Relied on for: That a manufacturer restricts its slightly abrasive gel cleaner to stoves with clear glass doors and directs owners of printed glass to a less aggressive cleaner. (states this directly)
Top tips for keeping your stove glass clean
HETAS Limited, United Kingdom · Trade or professional body
Relied on for: That sharp or abrasive materials damage stove glass and leave permanent scratches. (states this directly)
Kirk-Othmer Encyclopedia of Chemical Technology
John Wiley & Sons · Reference work
Relied on for: That glass-ceramics are engineered for low thermal expansion and are used in appliance applications requiring thermal shock resistance. (background and mechanism only)