Finding safe and effective ways to combat flies and other indoor pests can be challenging. This guide highlights five products commonly used to reduce flying insects, drain flies, ants, roaches, and general pests in homes or small offices. Each option offers a distinct approach—foam treatments, traps, plant-based sprays, foggers, and ultrasonic repellents—so you can compare methods and choose what’s best for your space and needs.
| Product | Approach | Best For |
|---|---|---|
| TERRO Drain Insect Killer | Foam drain treatment with extension tube | Drain flies, fruit flies, roaches |
| ZEVO Flying Insect Traps | Blue light trap with adhesive cartridges | House flies, gnats, fruit flies |
| STEM Plant-Based Bug Spray | Botanical insecticide | Ants, roaches, flies |
| BASF Pro-Control Plus Total Release Formula Fogger | Insect fogger for space treatment | Crawling and flying pests |
| Ortho Home Defense Fogger | Area fogger for outdoor/indoor use | Flies, mosquitoes, wasps |
TERRO Drain Insect Killer Foam Treatment

Terro’s drain insect killer creates a foam that expands within the drain, reaching biofilms and the breeding sites of drain flies and fruit flies. The extension tube allows precise placement, reducing spills and increasing targeting accuracy. As the foam dissipates, the product continues to work, breaking the life cycle of pests in drains and nearby areas. This option is suitable for kitchens, bathrooms, and utility rooms where drain flies are a common issue. Safety and usage directions should be followed for optimum results.
ZEVO Flying Insect Traps & Cartridges

ZEVO offers a plug-in trap using blue and UV light to attract flying insects such as house flies, fruit flies, and gnats. The model emphasizes mess-free disposal with an adhesive backing, letting users trap bugs without touching them. To operate, insert a disposable cartridge and plug the unit into an area where insects gather. When full, simply remove and replace the cartridge. This trap provides continuous attraction, potentially reducing populations over time without chemical sprays.
STEM Plant-Based Bug Spray

STEM’s plant-based insecticide is designed for indoor and outdoor use, featuring a botanically derived active ingredient. It is formulated to kill ants, roaches, and flies without synthetic dyes or harsh odors. The product emphasizes a safer profile for households with pets and children when used as directed. The botanical approach can be appealing for those seeking natural pest-control options without heavy chemical reliance.
BASF PT Pro-Control Plus Total Release Formula Fogger

The BASF Pro-Control Plus Total Release Formula provides fast-acting space treatment for a range of pests, including cockroaches, flies, stored product pests, spiders, and wasps. The fogger format enables quick dissemination across larger areas, making it suitable for commercial kitchens, restaurants, or animal housing alongside homes. Users should follow label directions to ensure effective coverage and minimize risks to people and pets when surfaces are treated.
Ortho Home Defense Backyard Bug Killer Area Fogger

This Ortho fogger targets a broad spectrum of outdoor and adjacent indoor pests, including flies, mosquitoes, wasps, hornets, yellowjackets, mites, and stink bugs. The formula is designed for use in outdoor spaces and around the home’s perimeter to create a protective barrier. It is helpful for patios, decks, and yards where flying insects pose a concern. Proper ventilation and following the product’s application guidelines are essential for safe use around people and pets.
Ultrasonic Pest Control Repeller (Two Pack)

Ever Pest’s ultrasonic repellers offer a non-chemical approach to indoor pest control. The two-pack solution is designed to deter a range of pests including rodents, ants, cockroaches, bed bugs, mosquitoes, flies, and spiders. The devices claim human and pet-friendly operation, with a night-light feature in some models. While ultrasonic devices can reduce pest activity in covered areas, results vary and may require multiple units for larger spaces.
Buying Guide: Key Purchase Considerations
- Target pest: Identify the primary pests (drain flies, house flies, gnats, ants, roaches, mosquitoes) to select the most effective method (drain foam, traps, sprays, foggers, or repellents).
- Space and environment: Consider indoor vs. outdoor use, room size, and ventilation. Foggers require vacated areas; traps and sprays may be safer in occupied spaces.
- Safety profile: For households with children or pets, prioritize plant-based or non-chemical options or choose devices with limited exposure. Always follow label directions.
- Longevity and maintenance: Foam treatments provide ongoing action after dispensing, traps require cartridge changes, and ultrasonic devices require placement considerations and power access.
- Usage frequency: Some products offer immediate knockdown, while others reduce ongoing activity with continuous exposure or coverage. Plan accordingly for ongoing or seasonal pest pressure.
- Residual effect: Evaluate how long the product remains effective after application, especially in kitchens, bathrooms, or food-related areas.
- Environmental and safety considerations: If you prefer minimal chemical exposure, lean toward botanical sprays, traps, or ultrasonic repellents, while recognizing that complete pest elimination may require integrated pest management.
The selections above present varied approaches to reducing fly and general indoor pest activity. Always read labels for application instructions, safety warnings, and any local guidelines. For persistent infestations, combining methods across spaces—such as drains with foam products, traps in high-traffic areas, and periodic fogging in larger rooms—can offer more comprehensive control without relying on a single solution.