Close-up of female hand holding spray bottle for cleaning with blue pump, on cyan background.

You might have heard by now that an ordinary household item such as Windex – a widely utilized glass cleaner – has the power to possibly kill spiders! However, how true is this?

Join us as we explore the facts and answer the question does Windex kill spiders?

Can Windex Eliminate Spiders?

Windex can indeed eliminate some spiders, but it’s essential to understand how it works and its limitations. If you can spray a lot of Windex directly onto a spider, it might kill it.

This is due to the presence of lethal chemicals in Windex, such as ammonia (ammonium hydroxide) and sodium dodecylbenzene sulfonate, which can block the spider’s lungs and suffocate it.

However, it’s important to note that Windex is primarily a cleaning agent, not a designated pesticide. Therefore, it should not be your go-to solution for spider control.

Additionally, the time it takes for Windex to eliminate a spider can vary, ranging from 1 to 15 minutes. This all depends on factors like the spider’s size, the amount of Windex applied, and the location of the application.

This means that using Windex as a spider repellent may not be efficient or effective.

Although using Windex can seem like a quick fix, you should consider more humane and safe methods for spider control.

Spiders are living creatures, and respecting their lives is essential. Killing them with a cleaning agent like Windex does not address the root cause of the problem and might not be as effective in eliminating spider eggs or nests.

wolf spider on wall

a) Ammonium Hydroxide and Its Role

The lethal component in Windex is its ammonia content, specifically ammonium hydroxide. When you spray Windex onto a spider, it blocks its book lungs and disrupts its breathing, eventually suffocating them.

Sodium dodecylbenzene sulfonate is another ingredient in Windex that contributes to the imbalance in spiders’ nervous systems and leads to their demise.

b) Exoskeleton and Windex Interaction

The exoskeleton of a spider plays a crucial role in its interaction with Windex. When sprayed with Windex, the spider’s exoskeleton might become numb and hinder its movement, making the spider more susceptible to the effects of Windex.

Keep in mind that Windex is not specifically designed as a spider killer, so there may be limitations to its effectiveness, especially concerning spider eggs.

When dealing with a spider infestation, it’s important to consider other methods or professional help to ensure your safety and effectively eliminate the spiders from your home.

Alternative Household Spider Control Methods

I. Using Vinegar and Essential Oils

Vinegar is a simple and effective solution that might deter spiders from your home. Mix equal parts water and white vinegar in a spray bottle and apply it to areas where you’ve noticed spiders or their webs. The vinegar’s strong smell might repel spiders without harming them.

The only issue with trying to repel them is if they are in the house they will just crawl to a different area.

Essential oils are another natural option to help with spider control. Peppermint, eucalyptus, and lavender oils can deter spiders when mixed with water and spritzed around your home. For the best results, regularly reapply these mixtures as the scent fades.

Not a great way to get rid of spiders. Who wants to keep spraying this every couple of days and there is really no way of knowing if it works?

II. Using Bleach to Kill Spiders

While bleach is a powerful cleaning agent, it’s important to use caution when considering it for spider control. Bleach can be harmful to both humans and pets if not used properly.

If you decide to use bleach to kill spiders, dilute it with water and wear protective gloves. Spray the solution directly onto the spiders or their webs but be aware of the potential for damage to surfaces and materials.

III. Insecticides

There are various insecticides available on the market designed to help control spiders and other pests in your home. There are some great commercial insecticides that can be used to kill spiders.

Best Choice

Spider Kit

  • CB-80 Aerosol
  • 100i Insect Monitors
  • Temprid FX
  • Kills spiders quickly
Concentrate to kill Additional Pests

Tempo SC Ultra

Tempo SC Ultra
  • Kills Spiders
  • No Odor
  • Controls over 100 Pests
  • Makes up to 30 Gallons
Additional Aerosol Spray

PT Phantom II

  • Easy-to-use Aerosol
  • Kills Spiders
  • No Visible Residue
  • Kills Long After Spraying

IV. Exterminator

In cases of severe spider infestations or dealing with poisonous species, contacting a pest control professional may be the best option. They can assess your situation and provide tailored solutions to effectively manage the issue.

Remember, it’s essential to take a balanced approach when dealing with spiders in your home.

Safety Concerns and Precautions with Windex

Potential Effects on Humans and Pets

While Windex is a common household cleaner, it’s important to know its potential effects on humans and pets.

The main ingredient in Windex, ammonia, can cause headaches, breathing difficulties, and eye irritation. Additionally, it can be toxic if ingested by humans or pets, especially children.

  • Ammonia: May cause headaches, breathing difficulties, and eye irritation.
  • Toxicity: Ingesting Windex may be harmful to humans and pets.

Appropriate Usage and Safety Guidelines

To ensure the safe use of Windex when attempting to kill spiders, follow these guidelines:

  1. Wear protective gear: Use goggles and a nose mask to shield your eyes and respiratory system.
  2. Ventilate the area: Open windows to enhance air circulation and prevent the buildup of fumes.
  3. Keep children and pets away: Use caution to ensure children and pets aren’t exposed to Windex during or after usage.
  4. Read the label: Follow the instructions and warning labels on the Windex packaging.

Adhering to these safety guidelines can minimize potential risks to yourself, your family, and your pets while using Windex to address spider problems.


Aside from its primary function as a household cleaner, Windex can also effectively eliminate spiders due to the presence of Ammonium hydroxide and Sodium dodecylbenzene sulfonate that disturb the spider’s nervous system leading to death.

To see if Windex can help with your spider problem just generously apply Windex directly onto their bodies.

Despite being effective when applied correctly; Windex shouldn’t substitute recommended pesticides for spider control, nor should it be used as a repellant.

Eco-friendly alternatives such as traps, natural repellents, and manual removal should be considered.

In conclusion, Windex might kill some spiders but it will not get rid of them all or a nest of spiders.


What household items effectively kill spiders?

There are several common household items that can help you eliminate spiders from your home. Some examples include:

  • Baking soda to kill spiders: Sprinkling baking soda around your home can deter spiders.
  • Diatomaceous earth: A natural substance that can be used to kill spiders and other insects when they come in contact with it.
  • Lysol to kill spiders: This will not kill many spiders and you have to spray a ton of it to kill a spider.

There are no guarantees these will work and so you should test them out to see if it works for you. I personally would just use the insecticide made to get rid of spiders.

Does Windex kill spider eggs?

There is no concrete evidence suggesting Windex is effective against spider eggs. While Windex may be able to kill some spiders, it likely lacks the chemicals necessary to eliminate eggs.

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