Can you mix bleach and toilet cleaner?
If the two have already been mixed: leave the room, open windows and doors from outside if you can reach them without breathing the air, and ring your national poison line. Do not go back in to neutralise it — adding a third chemical to a reaction in progress is the intuitive move and the wrong one, and most exposures happen to the person who returns to clear it up.
What actually happens
Toilet and limescale cleaners are usually acidic, because limescale is a carbonate and acid dissolves it. Adding bleach to an acid releases chlorine gas, and a toilet bowl in a small unventilated bathroom concentrates it around the person leaning over it. This is one of the most common accidental household chemical exposures there is.
How people end up doing it
Doing a thorough job. Bleach for the germs, then descaler for the limescale, in the same bowl without flushing in between.
What to do instead
Flush thoroughly between products, or use one and stop. If the two have mixed, leave the room and ventilate it.
Cleaning products
| Combination | Verdict | Why |
|---|---|---|
| Bleach and ammonia | Toxic gas | No. This is the classic household poisoning and it produces chloramine gas. |
| Bleach and vinegar | Toxic gas | No. Any acid plus bleach releases chlorine gas. |
| Baking soda and vinegar | Pointless | Safe, dramatic, and it leaves you with salt water. |
| Bleach and rubbing alcohol | Toxic gas | No. It produces chloroform and other chlorinated compounds. |
| Hydrogen peroxide and vinegar | Do not | No — mixed in a bottle it forms peracetic acid, which is corrosive. |
| One drain cleaner and a different drain cleaner | Toxic gas | No. Drain cleaners come in strongly acidic and strongly caustic types, and combining them is violent. |
| Bleach and hydrogen peroxide | Do not | No — it is exothermic and destroys both, and can spray hot liquid. |
| Vinegar and castile soap | Pointless | Safe, and it curdles into a white mess that is worse than either. |
| Vinegar and ammonia | Pointless | Not dangerous, and they cancel each other out. |
Common questions
- Can you mix bleach and toilet cleaner?
- No — this one produces a toxic gas. No. Most toilet cleaners are acidic, so this is the bleach-and-acid reaction.
- What happens if you do?
- Toilet and limescale cleaners are usually acidic, because limescale is a carbonate and acid dissolves it. Adding bleach to an acid releases chlorine gas, and a toilet bowl in a small unventilated bathroom concentrates it around the person leaning over it. This is one of the most common accidental household chemical exposures there is.
- What should I do instead?
- Flush thoroughly between products, or use one and stop. If the two have mixed, leave the room and ventilate it.
- What if I have already mixed them?
- Leave the room, ventilate it from outside, and ring your national poison line. Do not go back in to neutralise it.
Related pages
- Bleach and ammonia No — this one produces a toxic gas
- Bleach and vinegar No — this one produces a toxic gas
- Baking soda and vinegar You can, but it achieves nothing
- Bleach and rubbing alcohol No — this one produces a toxic gas
- Hydrogen peroxide and vinegar No — it damages something or fails
- One drain cleaner and a different drain cleaner No — this one produces a toxic gas
- Bleach and ammonia Also produces a toxic gas
- Bleach and vinegar Also produces a toxic gas
- Bleach and rubbing alcohol Also produces a toxic gas
- One drain cleaner and a different drain cleaner Also produces a toxic gas
- Hazard symbols What the pictogram on the bottle actually requires
Sources
- What Noises Cause Hearing Loss? — Centers for Disease Control and Prevention (Public domain (US Government))
- Occupational Noise Exposure — Occupational Safety and Health Administration (Public domain (US Government))