How to Get Rid of Cockroaches: A Step-by-Step Guide That Actually Works

Getting rid of cockroaches comes down to three things done together: take away their food and water, put out gel bait, and stay consistent. Skip the bug bombs (research shows foggers do almost nothing to roaches) and skip the idea that one spray will fix it. The single most effective do-it-yourself tool is cockroach gel bait, and the first move is to figure out which roach you actually have, because a tiny kitchen German cockroach and a big basement American roach call for slightly different tactics.

Here is the step-by-step that pest professionals actually use, with links to the detailed guide for your specific situation.

The Cockroach Plan at a Glance

Step	What it does	Key tools
1. Identify the species	Decides where to focus (kitchen vs drains)	Size, color, where you see them
2. Cut food & water	Starves them and makes bait the only meal	Cleaning, sealed food, fix leaks
3. Gel bait	The #1 killer; spreads through the colony	Pea-sized dots in cracks
4. IGRs & dust the voids	Stops breeding; reaches hidden bugs	Growth regulator, boric acid
5. Monitor, don’t fog	Tracks progress; foggers backfire	Sticky traps
6. Prevent	Keeps them from coming back	Seal entry, ongoing sanitation

Step 1: Identify Your Cockroach

The species tells you where to aim. Start with our guide to the types of cockroaches, then match yours:

• German cockroach (small, about half an inch, light brown with two dark stripes): by far the most common indoor roach and the fastest breeder. Lives in kitchens and bathrooms, close to food and water. This is the one most people are fighting. See how to get rid of German cockroaches.
• American cockroach (large, 1.5 to 2 inches, reddish-brown, also called a “palmetto bug”): lives in drains, basements, and sewers and wanders indoors. See American cockroaches and palmetto bugs.
• Oriental cockroach (dark, shiny, “water bug”): prefers cool, damp spots like basements and drains. See oriental cockroaches.

Not sure it is even a roach? Check what a cockroach looks like, bugs that look like baby roaches, and cockroach eggs.

Step 2: Take Away Their Food and Water

Cockroaches can go weeks without food but only days without water, so water matters most. This step starves them and, just as important, makes your bait the most appealing meal in the room.

• Fix leaky pipes, faucets, and the area under the sink; dry the sink at night.
• Store food in sealed containers, clean up crumbs and grease, and do not leave dishes or pet food out overnight.
• Empty the trash regularly and keep it closed.
• Cut the clutter (cardboard, paper bags) that gives them places to hide and breed.

Knowing what attracts cockroaches and what they hate makes this far easier.

Step 3: Gel Bait, the Most Effective Method

If you do only one thing, do this. University research consistently finds cockroach gel bait outperforms sprays, and a gel-bait IPM program cut infestations by about 74 percent in a year. It works through a “domino effect”: a roach eats the bait, returns to its hiding spot, and others are killed in turn by eating its droppings and remains.

• Place small, pea-sized dots of gel in the cracks and corners where roaches travel: inside cabinet hinges, behind and under appliances, along baseboards, near plumbing.
• Use many small placements rather than a few big globs. More bait stations means more roaches reached.
• Do not spray insecticide near the bait. Sprays repel roaches away from the bait and ruin the whole strategy. Bait and spray do not mix.
• Refresh the bait as it is eaten or dries out, and keep going for several weeks.

Step 4: Add Growth Regulators and Dust the Voids

To break the breeding cycle, pair the bait with an insect growth regulator (IGR), which keeps young roaches from maturing and reproducing. For the deep cracks and wall voids the bait cannot reach, a light application of boric acid or diatomaceous earth works mechanically and keeps killing over time. Apply dusts thinly into voids and under appliances, not in thick piles roaches will simply avoid.

Step 5: Monitor With Traps, and Skip the Foggers

Place a few sticky traps along walls and under sinks to see where activity is heaviest and whether numbers are dropping. What you should not reach for is a bug bomb: a study of four total-release foggers found no significant effect on German cockroach numbers after four weeks, because the mist never reaches the cracks where roaches hide, and it can drive them deeper or away from your bait. Here is more on getting rid of roaches without fogging.

Step 6: Keep Them From Coming Back

Once numbers drop, prevention keeps them gone: seal cracks and gaps around pipes, windows, and doors; keep up the sanitation from Step 2; and stay alert in the rooms roaches like. If you are in a multi-unit building, reinfestation from neighbors is common, so keep a few bait stations and traps in place long-term. See the specifics for cockroaches in the kitchen and cockroaches in apartments, and how to clear the lingering cockroach smell.

Cockroaches by Type and Situation

Jump to the detailed guide for yours:

• German cockroaches (the most common indoor pest)
• American cockroaches / palmetto bugs
• Oriental cockroaches
• Baby cockroaches
• Flying cockroaches
• In the kitchen and in apartments

When to Call a Professional

Call a pro if the infestation is large, keeps rebounding after weeks of baiting, or you share walls with other units where roaches travel between homes. A professional can apply stronger products, find hidden harborage, and treat the whole building. German cockroach infestations in particular can be stubborn, and a pro plus your sanitation usually clears them fastest.

Frequently Asked Questions

What kills cockroaches the fastest?

Contact with a labeled spray kills the few roaches you see immediately, but for the colony, gel bait works fastest overall because it spreads through the population within days. Speed comes from sanitation plus bait, not from one product.

Do cockroaches mean my house is dirty?

Not necessarily. Roaches come for food, water, and shelter, and they hitchhike in on bags, boxes, and used appliances. Clean homes get them too, though clutter and crumbs make it easier for them to stay.

Do foggers or bug bombs work on roaches?

No. Studies show total-release foggers have no significant effect on German cockroaches, because the mist does not reach their hiding spots and can scatter them. Targeted gel bait works far better.

Why do I still see roaches after treatment?

Eggs keep hatching for weeks, and sanitation gaps or spraying near your bait can stall progress. Keep baiting, fix any water sources, and give it several weeks of consistency.

Which cockroach is the hardest to get rid of?

The German cockroach, because it breeds the fastest and lives indoors year-round. It responds well to gel bait plus strict sanitation, but it takes persistence.

Sources

• Penn State Extension, “German Cockroaches”
• NC State Extension, cockroach IPM and gel-bait research
• Peer-reviewed research on the ineffectiveness of total-release foggers for cockroach control