How to Get Rid of
Cockroaches

Why DIY Cockroach Control Usually Fails

The most common cockroach problem — German cockroaches — is one of the pests most likely to resist and survive DIY treatment. The reasons are specific and important to understand:

• Retail sprays repel, not kill. Most consumer roach sprays contain repellents that cause cockroaches to scatter to untreated areas — making the infestation worse and harder to treat.
• No IGR in retail products. Insect growth regulators (IGR) prevent eggs from hatching and nymphs from becoming breeding adults. Most retail products do not contain effective IGR concentrations. Without IGR, killing adult cockroaches is temporary — the eggs hatch and the cycle repeats.
• Resistance. German cockroaches have developed documented resistance to common retail insecticide chemicals through decades of repeated exposure.
• Bombs and foggers are ineffective. Studies show roach bombs and foggers have minimal impact on German cockroach populations. They do not penetrate into the harborage areas (inside appliance motors, wall voids, cabinet hinges) where cockroaches actually live.

What Actually Works: The Professional Approach

Step 1: Sanitation — Remove Competing Food and Moisture

Before any treatment, reduce the food competition for bait: store all food in sealed containers, fix all plumbing leaks, clean grease from the stove, and remove cardboard (which provides both harborage and food). The less available food, the more attractive the professional bait will be.

Step 2: Professional Gel Bait in Harborage Areas

Professional gel baits (Advion, Maxforce, Vendetta) use a food-based attractant combined with a slow-acting insecticide. Worker cockroaches find the bait, consume it, return to the colony, and die there — where other cockroaches consume the contaminated feces and corpses, spreading the effect through the entire colony including the queen and nymphs. This cascade effect is why professional gel baits resolve infestations where sprays cannot.

Step 3: Insect Growth Regulator (IGR)

Applied to harborage areas alongside bait, IGR prevents eggs from hatching and nymphs from reaching breeding adulthood. This is the ingredient that breaks the reproduction cycle and prevents the infestation from rebuilding after adults are killed.

Step 4: Follow-Up Inspection

A follow-up inspection at 2-3 weeks confirms the colony is eliminated and re-treats any remaining harborage areas. Most professional gel bait treatments resolve a German cockroach infestation in 1-2 visits.