The usual harborage spots
Dishwasher
The frame, insulation and pan under a dishwasher stay warm and damp. Check the kick plate area and the gap between the machine and the cabinet.
Refrigerator
Motor housing, condenser area and drip pan hold heat and moisture. This is one of the most reliably productive places to inspect.
Stove and range
Grease accumulates in the gap beside and behind a range, and control panels and burner assemblies offer tight harborage.
Cabinet voids
Hinge recesses, back panels, shelf corners and the hollow toe-kick space under base cabinets are classic hiding places.
Sink plumbing
The penetration where the supply and drain lines pass through the cabinet base is both harborage and a route in from the wall void.
What keeps a kitchen population going
- Crumbs and food residue in appliance gaps and cabinet corners
- Grease film on range sides, backsplashes and hood filters
- Pet food left out overnight
- Cardboard boxes and paper bags in the pantry
- A slow leak or damp cabinet base under the sink
- Unrinsed recycling and uncovered trash
How to inspect your own kitchen
Work with a flashlight after dark, when activity peaks. Look for live roaches, dark specks resembling ground pepper along cabinet edges, shed skins and egg casings.
- Open every base cabinet and check corners and hinges
- Look under the sink at the plumbing penetration and cabinet floor
- Pull the range forward where safe and inspect both sides
- Check the refrigerator's lower rear area and drip pan
- Inspect the dishwasher kick plate and surrounding gap
- Place sticky monitors in two or three of these areas for a week
Steps that reduce pressure quickly
- Deep clean appliance gaps rather than visible surfaces
- Move dry goods and pet food into sealed containers
- Repair leaks and dry the under-sink cabinet
- Remove cardboard from the pantry and under-sink storage
- Empty trash nightly into a lidded container
- Vacuum droppings and shed material where you find them
How kitchen treatment is usually handled
For indoor-breeding species, targeted baiting into cabinet voids, appliance harborage and crack-and-crevice areas is the normal approach, paired with sanitation recommendations and monitoring. Broad spraying across countertops and floors accomplishes little and can scatter a population.
Follow-up matters, because egg cases present when treatment begins hatch afterward. See German cockroach control for a fuller picture of that species, and cockroach treatment for the general sequence.