CimeXa Dust Review [Epic Bed Bug & Insect Killer]

The Verdict
CimeXa Dust is a revolution for insecticide dusting.
Ease of Use
The Good
Effective for up to 10 years
Kills a wide variety of crawling insects including bed bugs
Excellent value for the money
The Bad
Applying any dusting product can be a bit tricky for beginners
Bug Lord Rating

If you’ve made your way to this page you’re probably doing some search into CimeXa Dust and wondering if it’s a good fit for your pest control needs. Let’s take a deep dive into everything there is to know about CimeXa Dust in this review so you can know if you need it and how to best apply it.

What is CimeXa Dust?

CimeXa Dust is non-repellent, low-toxicity engineered silica dust. It’s a white, odorless powder that’s very fine and lightweight.

It shares some similarities with diatomaceous earth, but as we will find out it’s actually much more effective.

CimeXa is sold by the bottle or bucket, and can be applied as any other powder would be. Most people would use a duster for application but it can depend on your specific needs and application sites.

How Does CimeXa Work?

CimeXa Dust works at the physical level rather than chemical level. Bugs come into contact with it and the dust destroy’s exoskeleton by absorbing moisture and oils. This causes bugs to rapidly die from dehydration, often within 24 hours.

CimeXa does not repel bugs. You want bugs to come into contact with CimeXa because that’s how it kills the bugs. Often times bugs will carry CimeXa Dust on their exoskeleton and transfer it to other bugs they come into contact with giving it great effectiveness.

What Does CimeXa Dust Kill?

CimeXa Dust kills a wide variety of insects. Most any bug that crawls and has an exoskeleton, CimeXa will kill. This includes bed bugs, spiders, fleas, ticks, lice, roaches, ants, firebrats, silverfish, drywood termites, mites and more.

Most often, people turn to CimeXa when dealing with interior pests like bed bugs.

How to Use CimeXa Dust

CimeXa Dust is typically applied with a handheld duster around the desired treatment areas. For bed bugs, this means cracks and crevices of floorboards, baseboards, furniture, mattresses, box springs, and more.

You have to understand the biology of the bug you’re up against so you know which areas you need to effectively get the powder into in order to kill the population.

In order to spread the powder, most people use a handheld duster. A handheld duster gives you pretty good control over how much powder to apply at once, and also lets you really shoot into crevices that bugs may love to live in.

For more fine control of the dust, you can dip a dry paintbrush into some of the powder and brush it as needed. This can be very useful for applying to areas where a duster would be overkill.

Finally, CimeXa Dust can also be mixed with water at a concentration of 4 oz to 1 gallon, and sprayed from a sprayer.

How Effective is CimeXa Dust?

CimeXa Dust has been well studied on its’ bed bug killing ability and found to be extremely effective.

One study done in 2016 found that 100% of bed bugs continuously exposed to CimeXa Dust died in just 36 hours, compared to 14 days for bed bugs exposed to the more common and cheaper alternative, diatomaceous earth.

Another study done in 2017 found some results that were both good and bad for CimeXa.

The good: bed bugs that came into contact with CimeXa killed over 95% of bed bugs within 24 hours and had a 100% mortality rate after 4 days. This was better than any of the 5 alternatives tested.

The bad: bed bugs seemed resistant to travel onto the CimeXa Dust and spent less time on the dust than 3 of the alternative products. That being said, the 3 alternative products where bed bugs were much less likely to crawl on killed anywhere from 30-90% of the bed bugs after 4 days so they were less effective after contact was made.

The conclusion I would take away from this is CimeXa is still a great option to use, you just want to be sure to apply it where you suspect the bed bugs are living because eventually they’ll be forced to move across the dust to feed or find water, so death will be certain eventually.

How Safe is CimeXa Dust?

CimeXa Dust is classified as being low-toxicity. Relatively speaking, it’s safer than most chemical alternatives. There are no protective requirements for the product listed on the label, but you may want to use gloves, a mask, and goggles when applying it.

Getting CimeXa onto your skin would cause it to dry out, so it’s recommended you rinse it off if anything comes into contact. The dust would irritate your lungs and eyes if it came into contact, but there’s no other known issues or side effects of using CimeXa Dust.

CimeXa Dust is labelled for use around pet bedding areas, so it’s safe for homes with pets as well. It is not known to be a water pollutant, hazard to wildlife such as bees, birds, and fish, and not known to have any harmful effects to humans such as causing cancer or developmental issues.

Who Manufactures CimeXa Dust?

Rockwell Labs researches and manufactures pest control products in Kansas City. In 2012 they released CimeXa Dust, which has been found to be a big improvement over other popular dusts from bed bug control.

Where to Buy CimeXa Dust?

The easiest place for the home DIYer to buy CimeXa Dust is from Amazon. Most big box stores don’t carry it currently at the time of writing.

Rockwell Labs CXID032 Cimexa Dust Insecticide, 4oz, White
  • For control of bed bugs, fleas, ticks, lice, roaches, ants, firebrats, silverfish, spiders, mites and dry wood termites
  • Kills bed bug adults, nymphs and nymphs hatched from dusted eggs – including parathyroid-resistant bed bugs
  • Labeled for treating cracks, crevices, voids, mattresses, carpets, pet rest areas, attics and many other areas

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Written by Wesley Wheeler

Wesley has over 10 years of residential and commercial pest control experience dealing with every kind of pest. He ran his own pest control company for 6 years and now shares his knowledge online.


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  1. How do I us Cimexa Insecticide Dust effectively to get rid of biting mites .( I have purchased a container of Cimexa Insecticide but I see written instructions and videos on how to get rid of bedbugs- which I’m not affected by)

    • Lorri – This may require a few different application methods. I would use Permethrin or Bifenthrin to spray along the baseboards of your home (do not spray furniture, carpets, or anything like that). These are residual insecticides that will kill mites that walk on it for weeks to months. I would also use Cimexa in the voids of electrical outlets and any other voids (under baseboards). However, it’s important to know that most biting mites are a result of a mouse or bird nests/infestation. Did you recently have an encounter with either of these? Looking for the source is very important.

    • Hi Cheryl – Ortho’s bed bug spray is a contact killer. Most bed bugs you find (typically) will be near the mattress, a place you do not want chemicals sprayed. And for baseboards and crevices, the Cimexa Dust works great for that. So my recommendation is to always use a high heat steamer on your mattress which kills the bed bugs, then treat baseboards, outlets, etc with Cimexa. Check out our full guide on bed bugs for step-by-step. You can still get the Ortho spot-spray for any you see on the floor that you want to kill quick though.

  2. How much of the 4 oz. bottle should we use of the Cimexa? Is the 4 oz bottle enough to take care of all the bed bugs? I have heard that there could be up to 500 of them at a time.

  3. What are the active ingredients in cimexa and what percent effective? We have had a case of bedbugs and need a potent ingredient to get those critters out or dead…. It’s a dust, correct? What is the lifespan of the dust?
    Is there a liquid (cimexa) to use to spray around the baseboards…
    Can I mix enough to spray around the house? Thank you for your time.

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