Updated:May, 2026

10 Best Foaming Drain Cleaner And Gnat Killer of 2026

Best Choice

9.9

Outstanding

Accelerator by Dr. Pooper

Drain Fly Killer Powder – Eliminates Drain Flies & Sewer Flies in Drains, Sinks, Showers – Fast-Acting Treatment - Septic Safe & Made in USA

Why We Love It

Targets and eliminates these common household pests in sinks, showers, floor drains, and garbage disposals. Disrupts the fly lifecycle to stop infestations before they spread.
Thick, expanding foam reaches deep into drains to dissolve organic buildup and destroy hidden breeding groundsthe root cause of recurring drain fly problems.
Gentle on pipes, tough on pests. This powder contains no harsh chemicals, making it ideal for homes with septic systems, older plumbing, or sensitive drain lines.
Each pack provides four complete treatments with 16 individual doses. Long-lasting protection for kitchens, bathrooms, utility rooms, and commercial spaces.
Manufactured to high safety and quality standards in the United States. Dependable results from a U.S.-based brand you can rely on.

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Why We Love It

Targets and eliminates these common household pests in sinks, showers, floor drains, and garbage disposals. Disrupts the fly lifecycle to stop infestations before they spread.
Thick, expanding foam reaches deep into drains to dissolve organic buildup and destroy hidden breeding groundsthe root cause of recurring drain fly problems.
Gentle on pipes, tough on pests. This powder contains no harsh chemicals, making it ideal for homes with septic systems, older plumbing, or sensitive drain lines.
Each pack provides four complete treatments with 16 individual doses. Long-lasting protection for kitchens, bathrooms, utility rooms, and commercial spaces.
Manufactured to high safety and quality standards in the United States. Dependable results from a U.S.-based brand you can rely on.

How We Find the Top Picks

We use smart data tools to review thousands of products and stores, analyzing ratings, reviews, and popularity trends to highlight what truly matters to shoppers like you.

Our experts then refine the results, blending AI insights with real user experiences to deliver accurate, up-to-date rankings that help you choose with confidence.

9.5

Excellent

NATURE'S DOME

Nature’s Dome Drain Fly Killer Gel | Kills & Prevents Drain Flies & Fruit Flies | Natural Plant-Based Fly Killer Treatment Indoor for Sinks & Pipes | Safe for Septic Systems | 32 Oz

Main Highlights

Powerful Drain & Fruit Fly Elimination: Effectively targets adult drain flies, fruit flies, sewer flies, eggs, and larvae providing fast relief from infestations in kitchen sinks, bathroom drains, and utility areas.
Safe, Plant-Based Formula: Made with natural ingredients including geraniol, cinnamon oil, and cottonseed oil. This eco-friendly gel is safe for pipes, septic systems, and pets while delivering professional-grade results.
Thick Clinging Gel for Deep Cleaning: The specially designed gel coats the walls of sinks, bathtubs, and pipes. Breaking down organic buildup where flies breed and preventing recurring infestations.
Keeps Drain Fresh & Odor-Free: Not only kills flies but also eliminates odors naturally by cleaning and maintaining drains. Ensuring your kitchen, bathroom and utility areas stay hygienic and smelling fresh.
Easy Overnight Application & Maintenance: Simply pour 48 Oz of gel into each affected drain. Let it work overnight for best results and repeat daily for active infestations or weekly for long-term prevention. Ideal for sinks, bathtubs, and all indoor drains.

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Main Highlights

Powerful Drain & Fruit Fly Elimination: Effectively targets adult drain flies, fruit flies, sewer flies, eggs, and larvae providing fast relief from infestations in kitchen sinks, bathroom drains, and utility areas.
Safe, Plant-Based Formula: Made with natural ingredients including geraniol, cinnamon oil, and cottonseed oil. This eco-friendly gel is safe for pipes, septic systems, and pets while delivering professional-grade results.
Thick Clinging Gel for Deep Cleaning: The specially designed gel coats the walls of sinks, bathtubs, and pipes. Breaking down organic buildup where flies breed and preventing recurring infestations.
Keeps Drain Fresh & Odor-Free: Not only kills flies but also eliminates odors naturally by cleaning and maintaining drains. Ensuring your kitchen, bathroom and utility areas stay hygienic and smelling fresh.
Easy Overnight Application & Maintenance: Simply pour 48 Oz of gel into each affected drain. Let it work overnight for best results and repeat daily for active infestations or weekly for long-term prevention. Ideal for sinks, bathtubs, and all indoor drains.

9.5

Excellent

Terro

TERRO Drain Insect Killer - T590 Drain Fly Killer Spray - Foam Treatment for Fruit Flies, House Flies, and Cockroaches (Pack of 2)

Main Highlights

The information below is per-pack only
TARGETS DRAIN INSECTS: Advanced TERRO drain insect killer foam with 3 insect growth regulators disrupts cockroach and drain fly life cycles, breaking infestation patterns for comprehensive pest control in drains and pipes
PRECISE APPLICATION: Extension tube enables precise targeting of roach killer foam into drainpipes and catch basins, ensuring complete 360-degree coverage to eliminate missed areas where pest larvae develop and thrive
ELIMINATES & PREVENTS INFESTATIONS: TERRO drain insect killer foam eliminates fruit flies, house flies, cockroaches, and drain flies during pupal stage and prevents new infestations from establishing
WORKS ON ALL PIPES: TERRO works on all pipe types including PVC, metal, and ceramic drains, making this cockroach killer suitable for kitchen sinks, bathroom drains, and floor drains in any household application
LONG-LASTING TREATMENT: This innovative foam provides up to 3 months of protection. Repeat applications every 2 to 4 weeks for severe roach killer indoor infestation control

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Main Highlights

The information below is per-pack only
TARGETS DRAIN INSECTS: Advanced TERRO drain insect killer foam with 3 insect growth regulators disrupts cockroach and drain fly life cycles, breaking infestation patterns for comprehensive pest control in drains and pipes
PRECISE APPLICATION: Extension tube enables precise targeting of roach killer foam into drainpipes and catch basins, ensuring complete 360-degree coverage to eliminate missed areas where pest larvae develop and thrive
ELIMINATES & PREVENTS INFESTATIONS: TERRO drain insect killer foam eliminates fruit flies, house flies, cockroaches, and drain flies during pupal stage and prevents new infestations from establishing
WORKS ON ALL PIPES: TERRO works on all pipe types including PVC, metal, and ceramic drains, making this cockroach killer suitable for kitchen sinks, bathroom drains, and floor drains in any household application
LONG-LASTING TREATMENT: This innovative foam provides up to 3 months of protection. Repeat applications every 2 to 4 weeks for severe roach killer indoor infestation control

9.2

Excellent

Green Gobbler

Green Gobbler Fruit Fly Goodbye Gel Drain Treatment | Killer Flies & Eliminator (1 Gallon)

Main Highlights

KILL FRUIT, DRAIN & SEWER FLIES: Get rid of the fly infestation and get back to enjoying your space. Green Gobbler's thick gel formula clings to pipes to eliminate annoying drain fly infestations. It kills fruit flies, drain flies and sewer flies.
PERFECT FOR HOMES & BUSINESSES: Green Gobbler is perfect for homes, hotels, restaurants, bars and anywhere with a fruit, drain, or sewer fly problem. It can treat garbage disposals, floor drains, kitchen sinks, bathrooms, shower drains and more.
EASY TO USE: Simply pour 8 ounces into your problem drain. This bottle uses anti-glug technology to help reduce splashing and provides up to 16 drain treatments. For best results, we recommend using product at night or during lowest time of use. Repeat daily until desired results are achieved.
MADE WITH CITRONELLA & CINNAMON: Our formula contains natural Citronella Oil and Cinnamon Oil to repel flies from your drain.
GREEN GOBBLER GUARANTEE: Green Gobbler cares about its customers. We take pride in developing innovative & effective products for your home or business. If for any reason you are unsatisfied, please contact us. We offer a money-back guarantee within 30 days of purchase.

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Main Highlights

KILL FRUIT, DRAIN & SEWER FLIES: Get rid of the fly infestation and get back to enjoying your space. Green Gobbler's thick gel formula clings to pipes to eliminate annoying drain fly infestations. It kills fruit flies, drain flies and sewer flies.
PERFECT FOR HOMES & BUSINESSES: Green Gobbler is perfect for homes, hotels, restaurants, bars and anywhere with a fruit, drain, or sewer fly problem. It can treat garbage disposals, floor drains, kitchen sinks, bathrooms, shower drains and more.
EASY TO USE: Simply pour 8 ounces into your problem drain. This bottle uses anti-glug technology to help reduce splashing and provides up to 16 drain treatments. For best results, we recommend using product at night or during lowest time of use. Repeat daily until desired results are achieved.
MADE WITH CITRONELLA & CINNAMON: Our formula contains natural Citronella Oil and Cinnamon Oil to repel flies from your drain.
GREEN GOBBLER GUARANTEE: Green Gobbler cares about its customers. We take pride in developing innovative & effective products for your home or business. If for any reason you are unsatisfied, please contact us. We offer a money-back guarantee within 30 days of purchase.

9.0

Excellent

Terro

TERRO T590 Drain Insect Killer Foam 1-Pack - Indoor Infestation Treatment for Cockroaches, Drain Flies, House and Fruit Flies with Extension Tube Application

Main Highlights

TARGETS DRAIN INSECTS: Advanced TERRO drain insect killer foam with 3 insect growth regulators disrupts cockroach and drain fly life cycles, breaking infestation patterns for comprehensive pest control in drains and pipes
PRECISE APPLICATION: Extension tube enables precise targeting of roach killer foam into drainpipes and catch basins, ensuring complete 360-degree coverage to eliminate missed areas where pest larvae develop and thrive
ELIMINATES & PREVENTS INFESTATIONS: TERRO drain insect killer foam eliminates fruit flies, house flies, cockroaches, and drain flies during pupal stage and prevents new infestations from establishing
WORKS ON ALL PIPES: TERRO works on all pipe types including PVC, metal, and ceramic drains, making this cockroach killer suitable for kitchen sinks, bathroom drains, and floor drains in any household application
LONG-LASTING TREATMENT: This innovative foam provides up to 3 months of protection. Repeat applications every 2 to 4 weeks for severe roach killer indoor infestation control

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Main Highlights

TARGETS DRAIN INSECTS: Advanced TERRO drain insect killer foam with 3 insect growth regulators disrupts cockroach and drain fly life cycles, breaking infestation patterns for comprehensive pest control in drains and pipes
PRECISE APPLICATION: Extension tube enables precise targeting of roach killer foam into drainpipes and catch basins, ensuring complete 360-degree coverage to eliminate missed areas where pest larvae develop and thrive
ELIMINATES & PREVENTS INFESTATIONS: TERRO drain insect killer foam eliminates fruit flies, house flies, cockroaches, and drain flies during pupal stage and prevents new infestations from establishing
WORKS ON ALL PIPES: TERRO works on all pipe types including PVC, metal, and ceramic drains, making this cockroach killer suitable for kitchen sinks, bathroom drains, and floor drains in any household application
LONG-LASTING TREATMENT: This innovative foam provides up to 3 months of protection. Repeat applications every 2 to 4 weeks for severe roach killer indoor infestation control

8.8

Very Good

Eco Strong

Fruit Fly Drain Treatment | Drain Fly Eliminator | Eliminates Gnats, Sewer Flies and More - Works in All Drains - 32 Fl Oz

Main Highlights

A Natural Fruit Fly Solution: Our non-toxic gel formula is safe for use around food and anywhere in the home, kitchen, bar, or restaurant.
Drain Flies, Sewer Flies, Gnats, or Fruit Flies, any flies like to be in drain scum found in drains, pipes, or garbage disposals. This natural formula cleans out the scum from the drains, and it is safe for your plumbing.
Home & commercial use: Our natural gel contains additional scum-busting properties, making this the most effective solution. Pour into a drain; this fast-acting treatment breaks up and digests drain scum.
Occasional use of this gel treatment will keep your drains odor and scum free. By preventing the buildup of organic scum, you remove the risk of another problem.
What to Expect: Some users commented that after the first treatment, they saw more flies. This is to be expected and means the product is working. By removing the drain scum, the flies leave. Please don't give up. Continue to treat as directed. You will see a decrease over the next few days or so.

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Main Highlights

A Natural Fruit Fly Solution: Our non-toxic gel formula is safe for use around food and anywhere in the home, kitchen, bar, or restaurant.
Drain Flies, Sewer Flies, Gnats, or Fruit Flies, any flies like to be in drain scum found in drains, pipes, or garbage disposals. This natural formula cleans out the scum from the drains, and it is safe for your plumbing.
Home & commercial use: Our natural gel contains additional scum-busting properties, making this the most effective solution. Pour into a drain; this fast-acting treatment breaks up and digests drain scum.
Occasional use of this gel treatment will keep your drains odor and scum free. By preventing the buildup of organic scum, you remove the risk of another problem.
What to Expect: Some users commented that after the first treatment, they saw more flies. This is to be expected and means the product is working. By removing the drain scum, the flies leave. Please don't give up. Continue to treat as directed. You will see a decrease over the next few days or so.

8.6

Very Good

Natural Armor

Fruit Fly & Drain Fly Killer - Commercial Gel Treatment – Eliminates Fly & Gnat Infestations - 1 Gallon

Main Highlights

FAST ACTING & EASY TO USE - Simply Pour This Specially Formulated Gel Solution Down Any Sink Drain Or Floor Drain Where Fruit Flies and Drain Flies Breed. Works On The Worst Fruit Fly & Drain Fly Infestations. Can Be Used In Bars, Bathrooms, Homes, Hotels, Kitchens & Restaurants
HOW IT WORKS SAFELY-This Thick Gel Treatment Clings & Sticks To Pipe Walls Eliminating The Fruit Fly & Drain Fly Eggs Effectively At The Very Source Of The Problem
HARMLESS & LONG LASTING - Harmless To Drains, Pipes, Septic Systems and Toilets. Unlike Other Corrosive Products, Natural Armor Is Made Of Natural Ingredients With No Toxic Substances. Depending On The Level Of Infestation, Long Lasting Results Can Be Seen For Months
GREAT FOR COMMERCIAL KITCHENS, BARS & RESTAURANTS - Clean Facilities Are Important. Our Product Is An Effective Food-Safe Solution!

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Main Highlights

FAST ACTING & EASY TO USE - Simply Pour This Specially Formulated Gel Solution Down Any Sink Drain Or Floor Drain Where Fruit Flies and Drain Flies Breed. Works On The Worst Fruit Fly & Drain Fly Infestations. Can Be Used In Bars, Bathrooms, Homes, Hotels, Kitchens & Restaurants
HOW IT WORKS SAFELY-This Thick Gel Treatment Clings & Sticks To Pipe Walls Eliminating The Fruit Fly & Drain Fly Eggs Effectively At The Very Source Of The Problem
HARMLESS & LONG LASTING - Harmless To Drains, Pipes, Septic Systems and Toilets. Unlike Other Corrosive Products, Natural Armor Is Made Of Natural Ingredients With No Toxic Substances. Depending On The Level Of Infestation, Long Lasting Results Can Be Seen For Months
GREAT FOR COMMERCIAL KITCHENS, BARS & RESTAURANTS - Clean Facilities Are Important. Our Product Is An Effective Food-Safe Solution!

8.3

Very Good

Kinzua Environmental

Fly-Zyme, Highly Concentrated Enzyme Drain Cleaner for Pipes, Drain Gel for Fruit Flies, Organic Waste Degrader & Odor Neutralizer, 32 fl oz

Main Highlights

Fruit Fly Control: Fly-Zyme's powerful enzyme formula targets and eliminates the root cause of drain and fruit flies by digesting food remnant buildup and preventing fly breeding in your drains, providing a cleaner and healthier environment
Powerful Clinging Action: The thickened bacterial enzyme gel clings to drain pipes and traps, effectively coating and digesting organic material; This targeted approach ensures thorough cleaning and rapid bacteria multiplication, breaking down organic matter
Safe Formula: Fly-Zyme drain fly eliminator contains no harmful insecticides or poisons; It uses non-pathogenic microorganisms and is salmonella-free, providing a safe solution for both commercial and household use
Versatile Application: Our enzyme-based drain cleaner is ideal for use in restaurants, bars, kitchens, garbage disposals, and anywhere organic matter accumulates in drains; Fly-Zyme can be used as a preventative measure or to tackle existing infestations
About Us: At Kinzua Environmental, we specialize in premium cleaning solutions that are safe and have professional strength for both commercial and household applications

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Main Highlights

Fruit Fly Control: Fly-Zyme's powerful enzyme formula targets and eliminates the root cause of drain and fruit flies by digesting food remnant buildup and preventing fly breeding in your drains, providing a cleaner and healthier environment
Powerful Clinging Action: The thickened bacterial enzyme gel clings to drain pipes and traps, effectively coating and digesting organic material; This targeted approach ensures thorough cleaning and rapid bacteria multiplication, breaking down organic matter
Safe Formula: Fly-Zyme drain fly eliminator contains no harmful insecticides or poisons; It uses non-pathogenic microorganisms and is salmonella-free, providing a safe solution for both commercial and household use
Versatile Application: Our enzyme-based drain cleaner is ideal for use in restaurants, bars, kitchens, garbage disposals, and anywhere organic matter accumulates in drains; Fly-Zyme can be used as a preventative measure or to tackle existing infestations
About Us: At Kinzua Environmental, we specialize in premium cleaning solutions that are safe and have professional strength for both commercial and household applications

8.1

Very Good

Questspecialty Corporation

Quest Specialty DIGEST PLUS Foaming Drain Cleaner and Odor Eliminator, 2 count

Main Highlights

DIGEST PLUS contains non-pathogenic bacteria that produce enzymes necessary for degradation of fats, oils, greases (FOG) and food by-products.
Thick, rich foam expands into areas otherwise impossible to reach; a 24-inch tube allows the user to apply deep into drains and pipes where build-up occurs.
DIGEST PLUS reduces odors and organic material
Eliminates fats, oils, grease and odors in disposals, grease traps, septic tanks, downpipes and drain lines
Made in the USA

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Main Highlights

DIGEST PLUS contains non-pathogenic bacteria that produce enzymes necessary for degradation of fats, oils, greases (FOG) and food by-products.
Thick, rich foam expands into areas otherwise impossible to reach; a 24-inch tube allows the user to apply deep into drains and pipes where build-up occurs.
DIGEST PLUS reduces odors and organic material
Eliminates fats, oils, grease and odors in disposals, grease traps, septic tanks, downpipes and drain lines
Made in the USA

8.1

Very Good

Green Gobbler

Green Gobbler Drain Cleaner and Deodorizer Sticks with Enzymes - Maintain a Clean Drain, Safe for Pipes and Septic Tanks, Use Monthly - 12 Pack

Main Highlights

ELIMINATE DRAIN CLOGS & ODORS: One Green Gobbler Drain Stick will help remove organic matter that can be the starting point for stinky odors and clogs. It works hard to deodorize pipes and attacks grease, food, fats, oils and scum that cause slow-moving drains.
ENZYME ENHANCED FORMULA: Simply drop one stick into your drain and the highly-concentrated and enzyme enhanced formula will start to work immediately. Use one a month. Each pack comes with a 12-month supply.
SAFE FOR ALL PIPES & SEPTIC: Green Gobbler Drain Sticks are safe for use in sinks, tubs, garbage disposals, toilet tanks, washing machine drains and septic systems. The strips will naturally break down over time.
POWERFUL YET SLOW DISSOLVING: Green Gobbler Strips destroy nasty drain odors over time. In a few weeks, you'll notice those drain odors disappearing.
GREEN GOBBLER GUARANTEE: Green Gobbler cares about its customers. We take pride in developing innovative & effective products for your home or business. If for any reason you are unsatisfied, please contact us. We offer a money-back guarantee within 30 days of purchase.

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Main Highlights

ELIMINATE DRAIN CLOGS & ODORS: One Green Gobbler Drain Stick will help remove organic matter that can be the starting point for stinky odors and clogs. It works hard to deodorize pipes and attacks grease, food, fats, oils and scum that cause slow-moving drains.
ENZYME ENHANCED FORMULA: Simply drop one stick into your drain and the highly-concentrated and enzyme enhanced formula will start to work immediately. Use one a month. Each pack comes with a 12-month supply.
SAFE FOR ALL PIPES & SEPTIC: Green Gobbler Drain Sticks are safe for use in sinks, tubs, garbage disposals, toilet tanks, washing machine drains and septic systems. The strips will naturally break down over time.
POWERFUL YET SLOW DISSOLVING: Green Gobbler Strips destroy nasty drain odors over time. In a few weeks, you'll notice those drain odors disappearing.
GREEN GOBBLER GUARANTEE: Green Gobbler cares about its customers. We take pride in developing innovative & effective products for your home or business. If for any reason you are unsatisfied, please contact us. We offer a money-back guarantee within 30 days of purchase.

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