Can You Mix Bleach and Vinegar?

Bleach and vinegar make chlorine gas, so keep them apart

The answer is no - never mix bleach and vinegar. Household bleach is a solution of sodium hypochlorite, and vinegar is dilute acetic acid. Adding an acid to bleach shifts the chemistry so that hypochlorite gives off chlorine gas. Poison Control, Health Canada, the Washington State Department of Health and Clorox all name vinegar or other acids as something never to mix with bleach, and the CDC says never to mix household bleach with any other cleaners or disinfectants.

The Washington State Department of Health lists burning and watery eyes, a runny nose, coughing, and breathing problems, and says higher exposure can bring chest pain, more severe breathing difficulty, vomiting, pneumonia, and fluid in the lungs. Fumes build up faster in a small room, such as a bathroom with the door shut. Some people add vinegar hoping to make bleach "stronger". It does not. It turns the bleach into a gas hazard.

It also helps to know what happens if you use them one after the other. Using bleach, rinsing thoroughly with water, drying, airing out the room, and only then using vinegar is a different situation from mixing. But the safest habit is one product per cleaning job. Toilets, tubs, and drains are the risky spots because residue sits in a small space, and a splash of vinegar-based cleaner onto a wet bleach film can release gas right at your face.

If the two have already met, leave the area, get fresh air, open windows from a distance, and call Poison Help at 1-800-222-1222. Do not add other products to try to fix the mixture. Call 911 for trouble breathing, chest pain, or fainting. For the cleaning job itself, pick one product, follow its label, and use soap and water first, because dirt blocks both bleach and vinegar from doing their work.

Where these numbers come from

The formulas and default values in this calculator are based on:

• CDC, Cleaning and Disinfecting with Bleach
• Poison Control (National Capital Poison Center), Chlorine gas: Get the facts
• Washington State Department of Health, Dangers of Mixing Bleach with Cleaners
• Health Canada, Reduce your risk from toxic gases: Never mix bleach with other cleaning products
• Clorox, How to Clean with Bleach Safely in Your Home - The Do's & Don'ts
• Poison Control (National Capital Poison Center), Need immediate assistance?
• America's Poison Centers, Get Poison Help
• HHS/HRSA Poison Help, What You Can Do. Confirm wording on your bottle's label

This is general household-cleaning guidance and planning math, not medical or professional advice. Product formulas change, so the label on your bottle always wins: follow its directions and warnings, test a hidden spot first, and never mix cleaning products. For a poisoning emergency call Poison Help at 1-800-222-1222 (US), or 911 if someone has trouble breathing.