Never mix bleach with ammonia, vinegar or other acids, or rubbing alcohol: these combinations release toxic gases such as chloramine and chlorine. Don't mix hydrogen peroxide with vinegar in the same container, and don't combine different drain cleaners. Use one product at a time, rinse surfaces between products, keep rooms ventilated, and store cleaners in their original containers.
Some common cleaners react dangerously when combined. Here is what never to mix.
Never mix these
| Combination | What it creates | Risk |
|---|---|---|
| Bleach + ammonia (including many glass cleaners) | Chloramine gases | Breathing problems, chest pain |
| Bleach + vinegar or other acids | Chlorine gas | Eye, throat and lung irritation |
| Bleach + rubbing alcohol | Chloroform and other compounds | Toxic, dizziness |
| Hydrogen peroxide + vinegar (mixed in one container) | Peracetic acid | Corrosive, irritating |
| Different drain cleaners | Violent reactions | Heat, splashing, toxic fumes |
Watch for hidden ingredients
- Toilet bowl cleaners are often acidic.
- Glass cleaners often contain ammonia.
- Some dishwasher and laundry products contain bleach.
Read labels before using two products in the same area.
Safe cleaning habits
- Use one product at a time and rinse with water before switching.
- Ventilate: open windows, run the fan.
- Keep products in their original containers with labels.
- Wear gloves; add eye protection for strong cleaners.
- Store cleaners out of reach of children and pets.
If exposure happens
Move to fresh air immediately. In the US, call Poison Control at 1-800-222-1222. Call emergency services for severe symptoms such as trouble breathing.
Common questions
What happens if you mix bleach and vinegar?
The acid in vinegar reacts with bleach to release chlorine gas, which can irritate the eyes, nose, throat and lungs.
What happens if you mix bleach and ammonia?
It releases chloramine gases, which can cause coughing, shortness of breath and chest pain. Many glass cleaners contain ammonia, so don't use them with bleach.
What should I do if I breathe in fumes from mixed cleaners?
Get to fresh air right away and call Poison Control (1-800-222-1222 in the US) or emergency services if symptoms are severe.