The DIY Pest Control Products That Actually Work (And the Ones That Don't)

Most of the pest control products at Home Depot and Lowe's are watered-down consumer formulations that kind of work sometimes. The professional-grade products that technicians load into their trucks are available to anyone online, they cost roughly the same, and they work dramatically better. Here's what I keep in my garage and what each product is good for.

Demand CS -- The Best General Perimeter Spray

Price: $35 for an 8oz bottle. Treats: 10,000+ square feet of perimeter. Active ingredient: Lambda-cyhalothrin (microencapsulated).

This is the workhorse. Mix 0.8oz per gallon of water and spray a 3-foot band around your foundation, around windows, around door frames, and up under the eaves. The microencapsulation means the active ingredient is locked inside tiny capsules that release slowly over 90 days, even in rain. Kills ants, spiders, roaches, crickets, centipedes, and most crawling pests on contact and by residual.

You need a 1-gallon pump sprayer ($15 at any hardware store). Spray quarterly and you've got the same perimeter barrier a pest control company charges $125-$150 per visit to apply. One bottle lasts most people an entire year.

Advion Cockroach Gel Bait -- Gold Standard for Roaches

Price: $25 for 4 tubes (1.06oz each). Active ingredient: Indoxacarb.

If you have German roaches, this is what the pros reach for first. Apply pea-sized dots in cracks and crevices near water sources: under the kitchen sink, behind the stove, along cabinet hinges, behind the toilet, inside the dishwasher door frame. Roaches eat the bait, go back to the harborage, die, and other roaches eat them. Secondary kill is a big deal with roaches because the ones you can see represent maybe 10% of the population.

Don't spray chemicals in the same area where you've placed gel bait. Sprays repel roaches away from the bait. Let the bait work on its own. You should see significant reduction within a week and near-elimination within three to four weeks.

Taurus SC -- DIY Termite and Ant Colony Killer

Price: $40 for a 20oz bottle. Active ingredient: Fipronil 9.1% (same as Termidor SC).

Taurus SC is the generic version of Termidor, the industry-standard termiticide. Same chemistry, fraction of the price. For termites, you dig a 6-inch trench around the foundation, apply 4 gallons of mixed solution per 10 linear feet, and backfill. It's labor-intensive but it creates a barrier that termites can't detect. They walk through it, pick up the fipronil, and transfer it to the colony. A single treatment lasts 5 to 10 years.

It also eliminates ant colonies. Pour diluted solution directly on fire ant mounds or spray around the foundation for carpenter ants. The transfer effect means foragers carry it back to the queen.

CimeXa Dust -- The Long-Game Killer

Price: $15 for a 4oz bottle. Active ingredient: Amorphous silica gel.

CimeXa is a desiccant dust that kills through dehydration, not chemical toxicity. Once applied in wall voids, attic spaces, behind outlet covers, and in cracks, it lasts 10 years or more as long as it stays dry. Kills bed bugs, roaches, silverfish, firebrats, ants, and any insect that contacts it.

Apply with a hand duster (Bellow Bulb Duster, $12) in a thin, barely visible layer. Too much dust and insects walk around it. You want a film so light you can barely see it. This product is the backbone of long-term prevention in wall voids and attic spaces where liquid sprays don't make sense. It's also safer than boric acid around pets because the dose needed to affect mammals is extremely high.

Gentrol IGR -- The Roach Reproduction Stopper

Price: $12 per point-source disc. Active ingredient: Hydroprene (insect growth regulator).

Gentrol doesn't kill adult roaches. It prevents nymphs from reaching reproductive maturity. Place one disc per room in areas with roach activity. Use it alongside Advion gel bait: the bait kills the current population while the IGR prevents the next generation. Without both, German roach infestations bounce back because a single egg case you missed produces 30 to 40 new roaches in about a month.

Termidor Foam -- Wall Void Treatment

Price: $22 per 20oz can. Active ingredient: Fipronil.

Inject through small drill holes into wall voids where carpenter ants, termites, or other pests are nesting. The foam expands to fill cavities, then collapses and leaves fipronil residue on every surface it touched. One can treats a surprising amount of void space. Great for situations where you can hear carpenter ants in a wall but can't access the nest without demolition.

Mosquito Bits -- Larval Control for Standing Water

Price: $10 for a 30oz bottle. Active ingredient: BTI (Bacillus thuringiensis israelensis).

Sprinkle a tablespoon into any standing water: bird baths, plant saucers, rain barrels, ditches, tree holes. BTI is a natural soil bacterium that kills mosquito larvae within hours but is harmless to fish, birds, pets, and people. It's the only larvicide the organic gardening world universally agrees actually works. Reapply every 7 to 14 days or after heavy rain. For anything larger than a puddle, Mosquito Dunks ($8 for a 6-pack) are the same active ingredient in a slow-release donut that lasts 30 days.

Products That Do Not Work

Ultrasonic repellers: Complete scam. The FTC has sued multiple manufacturers for false claims. Tested repeatedly by universities with zero measurable effect on any pest species. Save your $30.

Essential oil sprays (peppermint, cedar, etc.): They repel insects for minutes, sometimes. The active compounds evaporate almost instantly and leave no residual. A $20 bottle of peppermint spray gives you maybe 15 minutes of mild ant repellency. That's not pest control.

Foggers and bug bombs: These are actively harmful. The aerosol doesn't penetrate into cracks and voids where pests actually live. It does coat every surface in your kitchen with pesticide residue, contaminate dishes and food prep areas, and scatter roaches into adjacent rooms. Pest control companies make good money fixing the problems foggers create.

Citronella candles: Studies show they reduce mosquito bites by about 10% in the immediate vicinity of the flame. Any candle of the same size works about as well. The smoke is doing the work, not the citronella.

Where to Buy

DoMyOwn.com is the go-to for professional-grade products. Fast shipping, good product guides, and they sell the exact same formulations the pros use. Amazon carries most of these products too, but verify the seller is authorized -- counterfeit pesticides are a real problem on Amazon's marketplace. Local farm supply stores (Tractor Supply, local co-ops) carry some professional products, especially granular insecticides and herbicides.

For more on the differences between chemical and organic approaches, see our organic vs chemical pest control guide. And for a room-by-room prevention approach that reduces the need for chemicals in the first place, check the pest-proofing guide.