Why You Should Never Combine Bleach and Vinegar While Cleaning

Bottles of vinegar and bleach next to each other on a countertop

The Spruce / Sanja Kostic

When we encounter a tough-to-remove stain on a surface, our first inclination is to throw every product in the cleaning cabinet at the problem. If one product doesn't work, we try another. Or, we decide that combining two cleaners will surely produce the results we want.

While some cleaning products like baking soda and distilled white vinegar can be safely mixed, others can be deadly. Two products that work very well alone, vinegar and chlorine bleach, are highly toxic when combined.


According to the American Association of Poison Control Centers, exposure to dangerous household cleaning mixtures was the second most frequent report of poisoning in 2018.

What Happens When Vinegar and Chlorine Bleach Are Combined

Chlorine bleach is a strong oxidizer that makes a highly effective disinfectant and stain remover. Its active ingredient is sodium hypochlorite. The bottle of chlorine bleach you bring home contains sodium hypochlorite dissolved in water, creating hypochlorous acid.

Vinegar is made from fruits or grains through a process where alcohols are distilled and allowed to ferment as microorganisms process the alcohol into acetic acid and water. Distilled white vinegar is typically used for household cleaning. The distilled white vinegar you see in the condiment aisle contains around five percent acetic acid and 95 percent water. Cleaning vinegar contains around six percent acetic acid or is 20 percent stronger.

According to Thought Co.'s chemistry expert, Anne Marie Helmenstine, PhD, if you mix chlorine bleach with another acid, this reaction occurs and toxic chlorine gas is formed. The reaction is usually silent until you smell the fumes and begin to have negative effects. Pure chlorine gas is greenish-yellow in color, but because the household ingredients are usually diluted, the gas is invisible.


  • In addition to chlorine bleach, vinegar should never be combined with hydrogen peroxide. The combination creates peracetic acid, a corrosive and irritating substance.
  • Combining chlorine bleach with any acid, not just vinegar, can produce toxic gases. Products containing acids include some brands of glass and window cleaners, automatic dishwasher detergents and rinses, toilet bowl cleaners, drain cleaners, rust removal products, and brick and concrete cleaners.
  • Combining chlorine bleach and ammonia forms chloramine gases, also highly toxic. In addition to household cleaning ammonia, ammonia can be found in some glass and window cleaners, interior and exterior paints, and urine. Use caution when using chlorine bleach to clean litter boxes, diaper pails, or toilet bowls.
Person holding bottles of vinegar and bleach

The Spruce / Sanja Kostic

What to Do After Exposure to Chlorine Gas

  • Immediately leave the area where the exposure occurred.
  • If possible, increase the ventilation in the area by opening windows and doors.
  • If the gas is inhaled and symptoms appear, contact emergency services, a healthcare advisor, or your local Poison Control Center for care instructions.
Opening the window to increase ventilation

The Spruce / Sanja Kostic

How to Avoid Problems With Cleaning Products

  • Store all cleaning products in their original containers.
  • If you have transferred a cleaning product to a new spray bottle, label the contents clearly.
  • Store cleaning products that can have negative reactions when combined in separate areas.
  • Store all cleaning products in a cool, dry location out of the reach of children, pets, and vulnerable adults.
  • Read product labels and follow directions carefully. Call the manufacturer or consult their website if you have any questions about ingredients or usage.
  • Use only the recommended amount of any cleaner.
  • Increase ventilation in small areas by opening doors and windows or adding a circulating fan before cleaning with any product.
  • Wear protective gloves, clothing, and eyewear.
  • Rinse surfaces and flush drains completely with clean water before switching to another type of cleaner.
  • Know what to do if there is an emergency.
  • Wash your hands after using cleaning products and before eating or drinking.
  • Dispose of cleaners that have not been used within the last year. Their chemical stability may be compromised.
Person labeling a bottle of vinegar

The Spruce / Sanja Kostic

Article Sources
The Spruce uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. 2018 Annual Report. American Association of Poison Control Centers

    1. Hawley, B., Casey, M., Virji, MA., Cummings, KJ., Johnson, A., Cox-Ganser, J. Respiratory Symptoms in Hospital Cleaning Staff Exposed to a Product Containing Hydrogen Peroxide, Peracetic Acid, and Acetic AcidAnnals of Work Exposure and Health, 62,1,28-40, 2017, doi:10.1093/annweh/wxx087
  2. Dangers of Mixing Bleach with Cleaners. Washington State Department of Health