Does Ammonia Kill Mold?

Does ammonia kill mold?

Ammonia is very similar to chlorinated bleach – they are both toxic, and only kill mold on non-porous surface areas. And although we strongly advise against using harmful chemicals such as ammonia for mold removal, we will show you how. Just keep in mind that many natural ingredients can do the job just as well, if not better.

Topics Covered

  • Pros and cons
  • How to kill mold with ammonia
  • Does it work on clothes?
  • Conclusion

Pros and cons

The advantages are that ammonia is cheap, readily available, and will kill mold on non-porous surface areas, as well as mycotoxins/mold spores.

Not bad, right?

However, many other much safer ingredients will kill mold on both porous and non-porous surface areas, as well as mold spores/mycotoxins too.

There’s also the fact that ammonia is highly toxic. It becomes even more toxic when mixed with other cleaning solutions such as bleach.

How to kill mold with ammonia

Ammonia is a harmful substance, so safety is of paramount importance. Wear gloves and a breathing mask. Open all windows in the room you will be working in and keep people and animals away.

1: Fill a spray bottle with 50% clear ammonia and 50% distilled water. Shake the container properly.

2: Spray the solution onto the mold and allow it to sit for an hour.

3: After an hour, rub the mold away with a cloth.

4: Wash the area clean with soapy water to get rid of the ammonia and dry thoroughly.

Does it work on clothes?

Yes, ammonia can kill and remove mold/mildew on clothes too. Just keep in mind that removing mold from clothes with oxygen bleach is a far safer option.

1: Get a small container and fill it 50% clear ammonia and 50% water.

2: Ensure that the clothes you want to do mold spot removal on are 100% dry. Dip a rag or cloth into the ammonia/water solution and use it to rub the moldy parts until it comes off. Leave it on for 20 to 30 minutes.

3: Once all the moldy areas have been rubbed and sufficient time has passed for proper disinfection to occur, soak the clothes in the sink or bathtub to get rid of the ammonia.

4: Wash the clothes in the washing machine.


So does ammonia kill mold? Yes, it does, as long as it’s on a non-porous surface. But because of its toxicity, we don’t recommend its use as it can cause skin irritation, and inhaling the pungent fumes can cause nose, throat, and respiratory problems. There is an inexhaustible list of much safer mold killing solutions available, such as borax, tea tree oil, vinegar, and baking soda.

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