Does Bleach Kill Spiders? How to Use It?

Ah, spiders.

We all have a hate-hate relationship with spiders: During the cold seasons, spiders migrate to warmer like our centrally-heated house.

We’ll all rush to find household or DIY solutions to get rid of the spiders. Maybe you’re considering bleach (Sodium Hypochlorite)?

So, does bleach kill spiders? … YES, concentrated bleach (over 11%) has a high acidity that will kill the spider, their eggs, and other household pests like flies if you pour enough of the liquid solution on them. 


  • Bleach is not a green solution because of its high toxicity levels, so you need to wear protective equipment before spraying the chemical in your house.
  • You should also avoid using bleach on hardwood floors or structures made from natural materials such as wood or stone.

Also, check these top spider kilers. 

But if you want an easy and even more effective solution for spider control; use products made specifically for the extermination of these arachnids – like spider bait traps and insect growth regulators (IGRs).

Is Bleach an Effective Spider Killing Solution?

a. Bleach is Highly Acidic

Simply, Yes, bleach (at high concentration) has a high acidity that is effective in the killing of spiders, and will also eradicate other arachnids and insects.

Bleach’s acidic nature will disrupt cell activity in the spiders and hence cause their death. 

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  • Bleach has a chemical reagent, acetic acid, which will get rid of spiders and their webs. You can also spray bleach on the exterior part of your home or yard perimeter to keep spiders from coming in.
  • Also, for the spider’s ideal hiding areas, apply bleach with a spray bottle. The sprayer will make the bleach penetrate better.

Related: Foggers for Spider

b. Chlorine Fumes Poison Spiders

The chlorine fumes from the acidic bleach will destabilize the cell action in the spider’s body and thus poison dangerous spiders such as the black widows and brown recluses.

So, does Clorox kill black widows? or will bleaches kill spiders? Yes, Clorox will poison black widows as well.

  • However, some people might not like this option because they are afraid that using enough disinfectant at one time could affect their health. But remember! If you dilute properly with

But how long does it take for a spider to die after being sprayed? This depends on the spider’s size, and how it was exposed to bleach.

Some experts say that a diluted spray of bleach can kill spiders in as little as six seconds. But if you don’t dilute properly then it could take anywhere from 10 minutes for the spider to die from being sprayed with chlorine fumes.

If you have pets or children then these are some pretty good reasons why using Clorox may not be your best option!

But what about a black widow? The answer is yes – they will most likely die within 10 minutes after coming into contact with this form of poison.

This is because an acidic solution has been proven to cause necrosis which means tissue death due to cell disintegration.

Related: Spider Bite vs Mosquito Bite?

c. Bleach will cause Spider Suffocation

The reason for this is because a lot of insects use their exoskeletons to breathe through. This means when you pour or spray bleach onto them, they will die from suffocation.

Bleach will suffocate your spiders. “Bleach is a corrosive chemical that can cause problems for anything living with it, and spiders are no exception.”

It’s important to note that any other household cleaners may have the same effect on other tiny arthropods as well – but there has been little research done in the area so we’re not sure!

  • The answer is yes – spiders will most likely die within ten minutes after coming into contact with this form of poison.

d. Bleach has a Pungent Smell

Bleach can release fumes that are irritating to the nose and eyes but also steal moisture from the skin upon contact.

That’s why spiders will avoid areas sprayed with bleach due to its pungent smell; just like peppermint oil will repel spiders.

However, there are a few disadvantages to using bleach in this manner.

  • NB: It is very important to wear protective eyewear and clothing like gloves on your hands when using the corrosive bleach in order to prevent inhalation of fumes and getting chemical burns.
  • But bleach may also exterminate beneficial bugs such as bees, ladybugs, lacewings, house spiders – the later will prey on bugs like flies in the house.

Related: Do Spiders Have Wings

How to Use Bleach in Killing Spiders at Home

The over nearly 40,000 spider species hate water but you may still find them in the bathroom. You can use bleach to exterminate the spiders due to its acetic acid. Here’s what you’ll Require:

  • Vacuum or broom
  • Water
  • Bleach
  • Spraying bottle

Step 1: Mix Bleach with Water

First, mix the bleach product with water in a ratio of 1:3 or at worst – at equal measure.

Pour the bleach solution into your spray bottle. Then, shake the bleach solution appropriately.

See Also: Does Windex Kill Spiders

Step 2: Spray the Spiders

Next, spray the bleach solution directly on the spiders taking a range just of about five to ten inches. Considering the spider’s body size, spray until the spider is dead.

Spray the breach not just on spiders but also on the location you suspect to be inhabited by those insects plus their webs. But also, ensure to clean to remove dead spiders + their eggs.

Step 3: Clean up

Next, clean-up house to remove the dead spider and also wipe down the bleach from the various surfaces including the clogged drains.

But take precaution when spraying bleach and don’t use it on surfaces that’ll react with the solution as this would make the materials fade.

The materials to avoid bleach-spraying including carpets, fabrics, and sofas. But remember to put on great protective gloves, and avoid getting the solution on your eyes and skin.

Ensure to spray the bleach solution onto the spiders and areas in the house that the insects enter or hide.

Step 4: Vacuum Clean

Vacuum the floors and surfaces to remove the spiders and bleach. This is succeeded by sweeping the area and dumping the dead spiders into some trash can.

Further, thoroughly clean off the surfaces that were touched by the bleach mixture. Avoid inhaling any chlorine fumes or even allowing the mixture to touch your eyes or skin.

Also, you may allow some teabag to soak into the bleach mixture or surfaces that were touched. Further, remember that bleach may discolor your walls or floors.

Will Bleach Kill the Spider Eggs?

Bleach is effective in killing many pests. The household cleaning chemical will be toxic to both arachnids and insects including spiders + their eggs.

Using the bleach mixture with a spray bottle on the young spiderlings and spider eggs will kill these creatures.

The acidic condition of this bleach mixture will rapture the outer layer of the eggs and the exoskeletons of the young spiders  – killing them all.

Bleach will kill spider eggs, and it is safe to use as a method for destroying them. Bleach will cause spiders’ suffocation in the egg sacs because they are unable to absorb oxygen from the bleach vapors.

The fumes from bleach will kill the spider eggs as well as any spiders that happen to be in close proximity to those fumes.

  • In addition, sometimes wolf spiders hide their unhatched eggs inside old plant stems or other places where you won’t be able to find them with your eyesight; make sure there aren’t any of these hiding spots left after bleaching by using a flashlight.
  • It’s important that when applying bleach to liquid-proof containers used for storing foodstuffs that all lids are tightened securely on top of those containers before letting loose the fumes.


1. How Fast will bleach take to kill Spiders?

So, how long does it take for bleach to kill a spider? Well, bleach will take about 10 minutes to 2 hours in killing the spiders, depending on the spider’s size and the concentration of the bleach mixture. 

Biggers spiders will take longer to die with the bleach mixture – but smaller ones may take just a few minutes. For the faster killing of spiders, you may need to increase the bleach concentration.

2. Will Bleach Kill Brown Recluse Spiders?

The acidity (from acetic acid) in the bleach mixture will kill brown recluse spiders among other spiders and pests.

But bleach isn’t recognized formally as an insecticide since it has adverse side effects on surfaces (different materials) and humans.

But with brown recluse spiders, I recommend using contact aerosols such as Zenprox or spiders foggers as a more effective killer – use chemical treatment.

3. Does Bleach Exterminate the Black-Widow Spiders or Wolf Spiders?

These black-widow spiders are described as vary dangerous with their toxic bite, and thus you must be cautious when controlling them.

While bleach will be effective in killing many spider species, with the black widow spiders –  use alternative methods such as using your professional exterminator.

What about the Wolf Spiders? Yes, the bleach will kill the wolf spiders but it won’t be as fast since they are larger in size.


On whether, bleach can kill spiders; bleach’s ability to suffocate spiders is a side-effect, not an intended purpose for using it against them.

Spray diluted chlorine over the area where they are present and let sit for at least five minutes before leaving your home or getting back into bed.

  • This should take care of all crawling and wiggling vermin which may have invaded your life while you were asleep!
  • The other option would be flooding their environment with chemicals that are known to poison arthropods such as insecticides like pyrethrin (Azatrol), organophosphates, and propoxur (Baygon).

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