You spray every cockroach you see. They come back two weeks later. You're not imagining it — and you're not doing anything wrong. The issue is what's happening behind your cabinet wall. Here's why surface spray fails and what actually solves a cockroach problem.
What you actually have is a German cockroach
If your cockroaches are about 12-15mm long, light brown with two dark stripes behind the head, and they dash for cover the moment you switch on the kitchen light — that's Blattella germanica, the German cockroach. It's the species responsible for almost every recurring residential kitchen problem in Klang Valley.
German cockroaches don't fly. They live entirely indoors, in the warmest, darkest, most cluttered corners of your kitchen — behind the fridge motor, inside the dishwasher housing, around the gas stove control panel, and inside the wall voids that back onto your sink and microwave.
Why aerosol spray doesn't fix it
Aerosol kills the cockroaches you can see — that's the visible 10-20% of the population. The other 80% are hidden in harbourage zones the spray never reaches. Worse, repellent sprays trigger a stress response that pushes survivors further into the wall voids and accelerates egg production. You'll see fewer roaches for a week. Then the next egg case hatches.
Egg cases (called "oothecae") are particularly bad news because they're protected — a hard brown capsule glued under cabinet shelves and behind toe-kicks that contains 30-40 baby cockroaches. Most spray formulations don't penetrate them.
What actually works: gel baiting
Modern cockroach extermination uses targeted gel bait placed in harbourage zones. The cockroach feeds on the bait, returns to the colony, then dies — and gets cannibalised by other cockroaches, which transfers the active ingredient through the population. This kills the cockroaches you don't see, including the egg-laying females in the wall void.
Why the follow-up visit matters
Even with perfect baiting, the egg cases already in your kitchen will hatch over the next 2-4 weeks. The follow-up visit (we book it at 14 days as standard) catches that next generation before they can establish a new colony. Skip the follow-up and you'll see a small bounce-back.
What you can do yourself
- Stop competing with the bait. Don't spray Baygon near placed bait — repellent chemistry undoes the work.
- Cut food sources. Cover sugar, honey and pet food. Wipe down counters at night.
- Fix moisture. Cockroaches need water more than food — fix any dripping pipes under the sink.
- Declutter under-sink storage. Cardboard cartons and unused appliances are perfect harbourage.
When to call us
If you're seeing live cockroaches more than once a week in your kitchen, or coffee-ground droppings inside your cupboards, the colony is well past the point where retail aerosol will help. For F&B premises across SS15 and Bandar Sunway the situation gets compounded by deliveries bringing fresh egg cases in cardboard cartons — scheduled service is usually the only way to stay ahead of it.