Why isn't vinegar killing mold?

Author: Ms. Kiera Glover  |  Last update: Monday, September 1, 2025

Vinegar is good at killing plant matter, that much is true. But it can rarely penetrate deeply enough to kill fungi like mold down to the root. That's why it usually isn't truly effective in cleaning black mold, green mold, and most kinds of common house molds.

How long does it take vinegar to kill mold?

Pour enough undiluted white vinegar into the empty spray bottle to cover the area of mold growth. Spray the mold directly, fully saturating it with the vinegar, and allow the vinegar to sit for at least an hour. Don't be tempted to scrub or rinse; the mold needs time to completely absorb the vinegar.

What kills 100% of mold?

Hydrogen peroxide, commonly used to disinfect wounds, is active against a wide variety of micro-organisms including mold. It acts by releasing oxygen at a rapid rate, which kills mold by oxidizing the surface and breaking down proteins and DNA.

Will mold come back after cleaning with vinegar?

Yes, mold that is soaked in vinegar can still spread spores. While vinegar can help kill and remove mold on surfaces, it may not completely eliminate all spores. Mold spores are tiny and can easily become airborne, allowing them to spread to other areas even if the mold has been treated with vinegar.

What percentage of vinegar kills mold?

According to the U.S. Environmental Protection Agency, if the mold patch is smaller than 10 square feet, you can attempt to remove it. 2 Vinegar must have an acetic acid level of 4.0%−4.2% or higher to kill mold or mildew.

How to Kill Mold With Vinegar

Why does mold come back after cleaning?

Mold can come back after remediation if the underlying moisture issues aren't addressed. Continuous maintenance and moisture control are key to prevent mold recurrence.

What is the strongest mold killer?

Our Top Picks
  • Best Overall: SALE. ...
  • Best Fast Acting: RMR-86 Instant Mold and Mildew Stain Remover at Amazon $17. ...
  • Best Preventative: Mold Armor Mold Blocker at Amazon $11. ...
  • Best Eco-Friendly: CLR Mold & Mildew Stain Remover at Amazon $12. ...
  • Best Gel: Skylarlife Mold & Mildew Remover Gel at Amazon $15.

Is Clorox or vinegar better for mold?

Is bleach or vinegar better to kill mold? Vinegar is better at killing mold because it can work on both porous and nonporous surfaces. It also terminates molds at their roots so the mold won't return and is also safer than bleach.

What are signs of mold sickness?

Although symptoms can vary, the most common symptoms seen in people exposed to mold indoors include:
  • Nasal and sinus congestion.
  • Eye irritation, such as itchy, red, watery eyes.
  • Wheezing and difficulty breathing.
  • Cough.
  • Throat irritation.
  • Skin irritation, such as a rash.
  • Headache.

Can I leave vinegar on mold overnight in the shower?

Yes, you can leave vinegar on mould overnight, though this isn't necessary as it usually takes effect after an hour. However, you can't use any type of vinegar, for mould removal you must use distilled white vinegar.

Is distilled vinegar the same as white vinegar?

White vinegar, also known as distilled vinegar or spirit vinegar, is made by fermenting grain alcohol (ethanol) which then turns into acetic acid. Water is then added to the vinegar, so white vinegar is made of five to ten percent acetic acid and ninety to ninety-five percent water.

Does sunlight kill mold?

Yes. The type of ultraviolet light that can effectively get rid of mould is UV-C, which happens to be one of the three types of UV radiation produced by the sun. This is the reason sunlight is so effective at killing and preventing mould, and best of all, it does so without the need for harsh chemicals.

Can I spray vinegar on mold and leave it?

Vinegar is natural and safe mild acid that can kill 82% of mold species. Plus it doesn't give off dangerous fumes like bleach. If you want to use vinegar to prevent mold growth on surfaces, spray vinegar on the surface and leave it. Repeat every few days to keep the surface mold-free.

Does vinegar damage concrete?

More serious stains will need a higher concentration of vinegar. As much as just vinegar is fine! You should note that while vinegar is good at drawing a stain up and out of the concrete, it will damage the concrete if left on it for too long. It's best to keep the vinegar on for no longer than 15 minutes.

Why shouldn't you use bleach on mold?

Since bleach is only able to wipe up surface mold spores, it can't seep in to materials and effectively kill mold. This also increases the amount of moisture available, allowing deep-rooted mold to thrive rather than be removed. Always remember, mold needs heat/humidity or a water event to thrive.

What kills mold on contact?

Make a bleach solution to kill mold. Mix one cup of bleach in a gallon of water. Apply it to the surface but don't rinse it off. Mix a 50/50 solution of ammonia and water.

What does black mold look like?

Black mold is a type of fungus that looks dark green or black. There are many kinds of black mold, but when most people refer to it, they're referring to Stachybotrys chartarum (S. chartarum). It grows and spreads on materials that contain a lot of cellulose, including paper products, wood products and drywall.

What kills mold 100 percent?

Products You Can Buy for Killing Mold
  • Concrobium Mold Control.
  • RMR-86.
  • Clorox Clean Up.
  • Benefect.
  • Bleach.

How to clean mold without spreading spores?

Use a non-ammonia soap or detergent in warm water and scrub the entire area affected by the mold. Use a stiff brush or cleaning pad on block walls or uneven surfaces. Rinse clean with water. Dry completely.

What is the deadliest black mold?

Stachybotrys chartarum is sometimes referred to as "toxic black mold." But all kinds of mold can cause symptoms if you're sensitive to, or allergic to, mold.

Can mold just wipe off?

Occasionally, mold can be found in the bathroom, on a windowsill, shower curtain, or wall. This mold can be wiped off the surface with a damp cloth and cleaning agent (such as window or bathroom cleaner).

Is black mold the same as regular mold?

Black mold vs mold, non-toxic household mold will usually only strike allergic-type symptoms in the body from exposure, whereas black mold can lead to the development of serious health issues including respiratory issues and even cancer after long-term exposure.

Do you have to throw away everything after mold?

This is why many toxicologists recommend homeowners treat moldy belongings ASAP. Damaged items should be thrown away without question, and items that are easy to replace or inexpensive (i.e. clothes, food) should be tossed as a precautionary measure. Basically, it's better to be safe than sorry.

Previous article
What are the symptoms of Fusarium and Verticillium wilt in tomatoes?
Next article
How do I stop rain from overshooting my gutters?