Home PestsSpiders

Does Bleach Kill Spiders?

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In the world of home pest control, there are many myths and misconceptions. One such belief is that bleach, a common household cleaning agent, can be used to exterminate spiders. But is it true? And if so, is it a safe and effective method? This article will delve into the heart of these questions and offer a comprehensive look at the use of bleach as a spider control method.


Yes, bleach can kill spiders upon direct contact, as the acetic acid in bleach can damage the spider’s exoskeleton. However, it’s not a registered insecticide and is not the safest or most effective method for spider control. It’s also not environmentally friendly and can be harmful to humans and pets. Therefore, it’s recommended to explore safer and more sustainable alternatives for spider control.

Understanding Bleach and Its Effects on Spiders

Bleach, chemically known as sodium hypochlorite, is a powerful cleaning agent known for its ability to kill bacteria and fungi. But does it have the same effect on spiders? The answer is yes. Bleach can indeed kill spiders upon direct contact. The acetic acid in bleach can damage the spider’s exoskeleton, leading to its death.

However, it’s important to note that bleach is not a registered insecticide. Its primary use is as a cleaning and disinfecting agent, not a pest control solution.

How to Use Bleach for Spider Control

If you decide to use bleach as a spider control method, it should be done with extreme caution. The standard recommended mixture is one part bleach to three parts water. This diluted solution can then be sprayed directly on spiders from a distance of 6 to 10 inches.

Remember to wear protective gear while handling bleach, as it can cause skin irritation and damage to the eyes. It’s also crucial to clean the bleach off surfaces after use to prevent potential damage to materials like wood and stone.

The Downside of Using Bleach for Spider Control

While bleach can kill spiders, it’s not the best long-term solution. Bleach can be harmful to humans and pets, and it’s not environmentally friendly. It’s also corrosive, which means it can damage the surfaces where it’s sprayed.

Furthermore, bleach is not a selective killer. It may affect other beneficial insects in your home that help control other pests.

Alternative Methods of Spider Control

If you’re looking for a safer, more sustainable way to control spiders, there are several alternatives to bleach.

  1. Regular Home Maintenance: Keeping your home clean and clutter-free can help deter spiders. Regular vacuuming can remove spiders and their webs.
  2. Natural Remedies: Essential oils like peppermint or lavender oil are often touted as natural spider deterrents. While there isn’t much scientific evidence to support these claims, many homeowners find them effective.
  3. Professional Pest Control Measures: If you have a significant spider infestation, it may be best to call in the professionals. They can use registered insecticides that are designed to be safe for use in homes, yet effective in controlling spiders.
  4. Diatomaceous Earth: This natural substance made from fossilized remains of diatoms can be an effective alternative to pesticides. It’s non-toxic to humans and pets, but lethal to spiders and other crawling insects.


In conclusion, while bleach can kill spiders, it may not be the safest or most effective method for spider control. It’s important to consider the potential risks and negative impacts, as well as explore safer and more sustainable alternatives. After all, a healthy home is not just one that’s free of spiders, but also one that’s safe for its human and animal inhabitants.

Frequently Asked Questions

Can bleach be used as a repellent for spiders?

No, bleach is not an effective repellent for spiders. It can only kill spiders upon direct contact but does not deter them from entering your home or building webs.

Is it safe to use bleach in gardens for spider control?

It’s not recommended to use bleach in gardens as it can harm plants. Bleach can alter the pH of the soil, making it unsuitable for plant growth. It may also harm beneficial insects and microorganisms in the soil.

Can I use bleach for spider control if I have pets at home?

It’s not advisable to use bleach for spider control if you have pets at home. Pets may accidentally ingest bleach or get it on their skin or fur, which can lead to poisoning or irritation.

Are there any other household items that can kill spiders?

Yes, some household items like vinegar, baking soda, and salt are also known to kill spiders. However, like bleach, these are not registered insecticides and their effectiveness can vary.

Can bleach kill spider eggs?

While bleach can kill adult spiders, it’s not very effective at killing spider eggs. The eggs are often protected by a silk casing that can shield them from chemicals. Regular cleaning and vacuuming are more effective methods of removing spider eggs.

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