Does Bleach Kill Spiders? How Fast?

During the cold seasons, spiders will migrate to warmer spaces such as our centrally-heated home. Then, we’ll rush to find household solutions to control the insects. So, you as does bleach kill spiders? Does Bleach Kill Spiders

The short answer is, YES, bleach has high acidity enabling it to kill spiders, their eggs, and other household pests. Bleach will kill spiders through suffocation due to their exoskeleton-breathing. 

As a fungicide and a pesticide (non-registered), bleach will also kill bacterial cells. But bleach is a corrosive chemical – and hence it must be used with care when spraying around pets and kids.

Details: Does Bleach Kill Spiders? in How Long?

So, Yes, bleach is effective in the killing of spiders, and will also eradicate other arachnids and insects. Bleach will suffocate and kill the spiders as they breathe through their exoskeleton. 

Further, as a highly acidic solution, bleach will destabilize the cell action in the spider’s body. the chlorine fumes from this bleach will poison the spiders – and other arachnids. 

House spiders are beneficial as they’ll prey on bugs like flies in the house. But others like Brown Recluse or Black Widow are poisonous and dangerous – these must be killed if they refuge in the house. 

If the spiders pose a danger to you, your kids, or pets – or if you’re also arachnophobic – you’ll need to control them using various spider control methods or calling your favorite bug exterminator

  • Bleach has acetic acid that’ll remove not just spiders but their webs too. You may also spray the bleach solution on the exterior parts of your home – this will deter spiders from accessing the compound. 
  • Further, for the spider’s ideal hiding areas such as the dark crevices or gutters, apply the bleach using a spray bottle as it’ll make the solution to penetrate better. 

But ensure to wear appropriate protective eyewear and clothing to prevent burn injuries from the chemicals. 

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. 

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 to 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 spides and areas in the house that the insects enter or hide. 

See Also: Fogger for Fleas

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.

FAQs – Bleach on Spiders

1. How Fast will bleach take to kill Spiders? 

On-time, considering the spider’s size and bleach mixture concentrate, bleach will take about 10 minutes to 2 hours in killing the spiders.

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?

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 – I recoined you use alternative methods such as using your professional exterminator. 

3. Does Bleach Kill the Wolf Spiders? 

Well, Yes, the bleach mixture will kill the wolf spiders but this will take longer since the species is much larger. 

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 spiderling  – killing them all.


The considerably “natural”, but non-commercial pesticide will kill spiders, arachnids, and insects within anywhere from 5 minutes. The bleach spray also kills the spider spiderlings and eggs.

Besides, bleach will kill bacterial cells as a pesticide and fungicide while also neutralizing anthrax but may also discolor or damage colored surfaces like fabric.

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