You paid for treatment and now there are cockroaches in the open, in daylight. Before you panic or call it a failure: this is almost always the treatment working, not failing. Here is the day-by-day timeline for gel bait, why activity spikes before it drops, and the one pattern that means you should call us back.
WhatsApp us how many days it has been and what you're seeing. We'll tell you if it's normal flushing or a real problem in 2 minutes.
Seeing more cockroaches in the first 24 to 48 hours after treatment is normal and expected. Technicians call it the flushing effect. The product drives roaches out of wall voids, cabinet hinges, and the harbourage behind and inside appliances, so you suddenly see the ones that were always hiding. They often look sluggish, wander in the open, and appear in daylight, which is unusual for a healthy colony. That daytime, disoriented behaviour is the sign the treatment has reached them.
You will keep finding dead and dying roaches for up to about two weeks. That is the bait working through the colony, not a fresh infestation. The mistake most people make is reacting to the spike instead of waiting it out.
Do not spray your own retail insecticide (Raid and similar) on treated areas. Every pest technician agrees on this. Retail sprays are repellent: they scatter the colony and push roaches away from the gel bait they need to eat. The whole point of gel bait is that roaches feed on it and carry the toxin back to the nest. Spray over it and you break that chain, so the colony survives and spreads to new corners of the flat.
If you spray retail insecticide over gel bait, you don't speed the job up. You cancel it. The roaches stop eating the bait and scatter to untreated rooms.
Also hold off on deep-cleaning the treated skirting boards and wall-floor junctions for the first 5 to 10 days. Scrubbing those areas removes the residual product exactly where roaches travel.
Gel bait is designed to kill slowly on purpose. An individual roach dies 24 to 72 hours after feeding (as fast as 6 hours, as slow as 4 days in some cases). That delay lets it return to the harbourage and pass the toxin to others through its faeces and through cannibalism, the domino or secondary kill effect. Here is what a normal treatment looks like:
| When | What you should see |
|---|---|
| Day 1 to 2 | Activity spikes. More roaches in the open, sluggish, in daylight. This is flushing, and it is a good sign. |
| Day 3 to 7 | Visible activity drops noticeably. You start finding dead roaches. Fewer live ones each day. |
| Week 2 | Dead and dying roaches still turning up. First newly hatched nymphs may appear as old egg cases hatch. |
| Week 3 to 4 | Should be quiet. In lighter infestations, 80 percent or more of the colony is gone by about day 14. Any sightings are usually tiny nymphs. |
| Beyond 3 weeks, still heavy | Not normal. Call us for a callback or second treatment. |
Full collapse depends on how bad the infestation was to start with: light takes 2 to 3 weeks, moderate 3 to 8 weeks, and heavy 1 to 4 months. German cockroach jobs commonly run up to about 5 weeks with a standard second treatment scheduled 2 to 4 weeks after the first. A follow-up visit is normal practice, not a sign the first treatment failed.
Send us a photo of what you're finding and how many days it has been. We'll tell you if it matches the normal timeline.
Cockroach egg cases, called oothecae, resist the chemical. Eggs already laid before treatment survive it and hatch on their own schedule. German cockroach eggs hatch in roughly 2 to 4 weeks, so a wave of new nymphs can appear for 2 to 3 weeks after treatment. This is why activity seems to persist, then fade, rather than stopping the day after the technician leaves.
Those nymphs then meet the residual product left on surfaces, or the scheduled second treatment, and die before they breed. By days 14 to 21 most visible activity should stop. If the roaches you still see are small, pale nymphs rather than full-size adults, that is the tail end of the old egg population, not a new infestation.
Here is the honest test. Compare what you are seeing against these two columns.
| Treatment is working | Treatment may have failed |
|---|---|
| Fewer live roaches week over week | Steady or rising adult numbers past 3 weeks |
| Dead roaches present, you keep finding bodies | No dead roaches at all |
| Sluggish, disoriented, daytime activity early on | Healthy, fast roaches still active at night |
| Only tiny nymphs left by week 2 to 3 | Full-size adults still common |
| Activity shrinking to fewer spots | Activity spreading to new untreated areas |
If you are mostly in the left column, wait it out. If you are firmly in the right column past three weeks, something is wrong: a missed harbourage, a resistant population, or an outside reinfestation source that keeps topping the colony back up.
Dubai changes the maths. The heat plus high indoor humidity from AC condensation means there is no seasonal die-off. Roaches breed year-round, so a colony rebuilds faster here than in a cooler climate. That is exactly why the residual product and a second visit matter more, not less.
The German cockroach numbers are the reason follow-up is standard: one female can seed a colony of hundreds within about three months. So still seeing a few roaches after treatment, and needing a second visit, is the normal course of the job, not a failure.
The biggest hidden cause of "still seeing roaches" in Dubai is your building, not your flat. Apartments share drainage, utility ducts, and refuse chutes between units. Those are highways for cockroaches. Very often the roaches you keep seeing are reinfestation walking in from an untreated neighbour or a common drain, not survivors of your treatment. The fixes:
As a rule of thumb in Dubai: American cockroaches typically enter through drains, while German cockroaches nest inside kitchen appliances. Your technician will confirm which species you have and where it is coming from, so defer to their call on the ground.
Flushing and new sightings are normal for the first 1 to 2 weeks. New tiny nymphs are normal into week 2 to 3. What is not normal is continued heavy activity beyond 3 weeks, no dead roaches, or the problem spreading to rooms that were fine before. Any of those means a callback is due, and on our jobs the second treatment is already built into the plan for German cockroach infestations.
WhatsApp us the timeline and what you're finding. If it's a real problem, we come back. Fixed price, warranty on the job.