STEM Kills Indoor and Outdoor Flies Mosquitoes and Gnats Insect Killer Bug Spray, 10 oz
STEM Kills Indoor and Outdoor Flies Mosquitoes and Gnats Insect Killer Bug Spray, 10 oz
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STEM Kills Indoor and Outdoor Flies Mosquitoes and Gnats Insect Killer Bug Spray, 10 oz

Key item features

  • Bug spray that quickly kills flies, mosquitoes, and gnats
  • Plant-based active ingredient bug killer safe for use around people and pets (when used as directed)
  • Entomologist tested bug spray made with botanical extracts to kill bugs; with the fresh scent and no added dye, fragrance, or harsh chemical odors
  • Bug killer for indoor and outdoor use, wherever bugs try to bother you​
  • Rooted in Nature, Optimized by Science
Current price is $7.2872.8 ¢/oz
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Customer ratings & reviews

4 out of 5 stars
stars1,151 ratings409 reviews
How item rating is calculated
1.4
3.2
4.3
1.8
3.8
0.3

Reviews summary

Pros

  • : Has a simple trigger or twist-to-use mechanism.
  • : Kills and repels flies, mosquitoes, and gnats on contact.
  • : Product is safe for use around pets without harm.
  • : Has a non-overpowering and natural scent.
  • : Quickly kills mosquitoes, providing relief.

Cons

  • : Leaves behind a residue that requires cleaning.
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Showing 1-3 of 409 reviews

May 19, 2025
Chert
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

Stems Kill Fly Spray

Does the job! Caution, I sprayed some in the kitchen %26 it got on the floor and a few min later, I went back and slipped. Please be careful. So now I just use it where I wont be walking. Trash cans outside, etc. I've bought it a couple of times bc it works. Kills maggots in the big trash can outside as well. Yep, its summer folks...

Helpful?1SFP9QAIORZE1229492393
reply from stem Team

We appreciate you sharing this with us! We’re sorry to learn about what happened. Please know comments like yours are taken seriously and we’d like to talk more about your experience. When you have a moment, give our team a call weekdays from 8 a.m. to 5 p.m. CT at 877-869-7546 and provide this reference number: 22858681. We look forward to your call! – Mindi, STEM Consumer Care

Dec 23, 2025
Elmer
Top Reviewer
Item details
Multipack quantity: 1
5 out of 5 stars review

Verified Purchase

This is the best thing I have found for flying insects in the home. It killed our fruit flies that had come in from the cold last week. It's safe around kids, the elderly, and pets. Our household was a good example for it's use. No more toxic sprays for us. A great buy.

Helpful?1SFP9QAIORZE1229492393
Apr 11, 2025
Jacqueline
Top Reviewer
Item details
Multipack quantity: 1
3 out of 5 stars review

Verified Purchase

Cannot recommend

I am so torn in regards to a rating for this product since I both love it and hate it. To begin with, it really is one of the ONLY products that actually kills gnats on contact like a lot of products say they do, but don't. With other products (and we have tried so many) those horrible gnats just laugh and keep flying around. This STEM spray stops them dead in their tracks. That said, the oily film this spray leaves behind is almost as awful as the gnats themselves, and I am not exaggerating. No matter how little you try to spray, it looks as if you've spilled oil all over the place. If you have hardwood floors, it is just untenable. Also, we have four dogs and we literally had to close off the area for DAYS even though we threw towels on the floor because we really don't trust it to be safe for them seeing as the stuff won't dry on its own! Yes, gnats are probably (as we have found) one of the worst issues to deal with, and when dealing with such a pest problem you think there's nothing you won't go through to get rid of them. Unfortunately, the sopping mess this spray leaves behind is just a step too far. I simply cannot stress how much oily residue this spray leaves behind and therefore, just cannot recommend it.

Helpful?1SFP9QAIORZE1229492393