Compatibility file № 0365 · alkali · Hard surfaces
Can you use ammonia on granite?
Better not. Ammonia on granite risks damage, and there is a safer option for almost every stain. It breaks down granite sealer.
01 The verdict
Better not. Ammonia on granite risks damage, and there is a safer option for almost every stain.
- Avoid It breaks down granite sealer.
02 Why: the two sides
Granite
Granite is porous stone, so spills can soak in and stains have to be drawn back out.
Granite itself is tough, but its sealer is not; harsh chemicals wear it away and let the next spill in.
It is porous, so time matters: the longer a spill sits, the deeper it goes.
Household ammonia
Clear household ammonia, about 5–10% ammonium hydroxide. Used very diluted. pH 11–12.
Never mix with chlorine bleach: it releases toxic chloramine gas.
03 Use instead
Follow the stain file for the specific stain on granite; each one picks the safe product for that combination.
04 Stain by stain on granite
| Stain | Ammonia? | What the file does |
|---|---|---|
| Matcha | Not used | Baking-soda poultice, 24–48 h |
| Tomato sauce and ketchup | Not used | Baking-soda poultice, 24–48 h |
| Turmeric and curry | Not used | Baking-soda poultice, 24–48 h |
| Grease and cooking oil | Not used | Cornstarch on it, overnight, brush off |
| Butter | Not used | Cornstarch on it, overnight, brush off |
| Chocolate | Not used | Baking-soda poultice, 24–48 h |
| Gravy | Not used | Warm water and a drop of dish soap |
| Salad dressing | Not used | Cornstarch on it, overnight, brush off |
| Egg | Not used | Warm water and a drop of dish soap |
| Avocado | Not used | Baking-soda poultice, 24–48 h |
05 What the granite files use most
Across the 32 stain files for granite, these are the products the methods rely on most; ammonia is not among the top five.
06 More about ammonia
Alkalis break down fats and acidic soils and help detergents work. Strong alkalis damage protein fibres such as wool and silk, and can dull stone and wood finishes.
On an ingredient list, ammonia shows up as ammonium hydroxide, ammonia or "ammonia D".
- Its smell is close to urine and can draw pets back to the same spot.
Never mix it with chlorine bleach. Why.
07 Already used it?
Rinse it off with plenty of plain water and let the item dry naturally before judging. Most damage shows once dry: loss of colour, a change in texture or a ring.
08 Questions
Is diluted ammonia safe on granite?
Diluted is less risky, but the problem is the chemistry, not the strength: it breaks down granite sealer.
What should I use on granite instead of ammonia?
Use the method in the stain file for the specific stain: on granite the right product depends more on the stain than on habit.
Can I mix ammonia with other cleaners on granite?
Do not combine cleaners unless the exact product manufacturers explicitly direct that use. This ingredient-level file cannot establish compatibility of commercial formulas. Rinsing alone does not prove that later use of a different cleaner is safe, especially on porous materials.
Does ammonia remove stains from granite?
None of the 32 files for granite uses it. Absence from the model does not establish either effectiveness or safety.
How long can ammonia stay on granite?
Do not use it as a routine home treatment on this material. For accidental contact, follow the product and item instructions and obtain advice if needed.