Compatibility file № 0351 · alkali · Clothes
Can you use ammonia on a wool sweater?
No. Ammonia damages a wool sweater. Alkalis damage wool and silk; ammonia yellows and weakens them.
01 The verdict
No. Ammonia damages a wool sweater.
- Never Alkalis damage wool and silk; ammonia yellows and weakens them.
02 Why: the two sides
Wool and cashmere
A wool sweater is made of keratin, the same protein as hair, so it reacts to alkalis, oxidisers and protein-digesting enzymes the way hair does.
It is delicate: short contact times and gentle handling matter as much as the product.
Wool felts when heat, moisture and agitation combine, and felting is permanent.
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 wool sweater; each one picks the safe product for that combination.
04 Stain by stain on a wool sweater
| Stain | Ammonia? | What the file does |
|---|---|---|
| Matcha | Not used | Fabric-approved gentle wash; follow label dose and time |
| Tomato sauce and ketchup | Not used | Fabric-approved gentle wash; follow label dose and time |
| Turmeric and curry | Not used | Fabric-approved gentle wash; follow label dose and time |
| Grease and cooking oil | Not used | Cornstarch on it, 15–30 min, brush off |
| Butter | Not used | Cornstarch on it, 15–30 min, brush off |
| Chocolate | Not used | Fabric-approved gentle wash; follow label dose and time |
| Gravy | Not used | Fabric-approved gentle wash; follow label dose and time |
| Salad dressing | Not used | Cornstarch on it, 15–30 min, brush off |
| Foundation and concealer | Not used | Fabric-approved gentle wash; follow label dose and time |
| Lipstick | Not used | Fabric-approved gentle wash; follow label dose and time |
05 What the wool and cashmere files use most
Across the 27 stain files for a wool sweater, 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 immediately and thoroughly in cool water. If the area feels harsh, thin or looks yellow, the fibre itself is damaged; a specialist cleaner may be able to even out the colour, but weakened fibre cannot be restored.
08 Questions
Is diluted ammonia safe on a wool sweater?
No. Dilution slows the damage but does not change what ammonia does to a wool sweater: alkalis damage wool and silk; ammonia yellows and weakens them.
What should I use on a wool sweater instead of ammonia?
Use the method in the stain file for the specific stain: on wool sweater the right product depends more on the stain than on habit.
Can I mix ammonia with other cleaners on a wool sweater?
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 a wool sweater?
None of the 27 files for wool sweater uses it. Absence from the model does not establish either effectiveness or safety.
How long can ammonia stay on a wool sweater?
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.