To find out where cockroaches are coming from, conduct a localized inspection in the dark using a flashlight. Target warm, moist areas with access to food and water, such as kitchens and bathrooms. Look closely for live bugs, shed exoskeletons, egg casings (oothecae), or dark droppings that resemble coffee grounds.
Get Them Out!
Cockroaches prefer to shelter in narrow cracks and crevices. Check behind refrigerators, under sinks, and in dark drawers or cabinets. They forage for food at night, eating a wide variety of foods and non-food materials. This allows them to survive even in clean homes.
Squashing a cockroach is generally advised against because it spreads dangerous pathogens, leaves behind chemical scents that can attract more roaches, and risks crushing an egg sac that leads to a hidden infestation.
Even a spotless house can attract roaches because they only need three things to survive: food, water, and shelter. Roaches are highly opportunistic, meaning they can thrive on microscopic food sources, hide in tiny crevices, or travel from the outdoors and neighboring units.
To kill roaches on contact immediately, use a commercial aerosol spray like a standard pyrethrin-based bug killer or a DIY mix of dish soap and water in a spray bottle. To eliminate the root infestation, apply high-quality gel baits and dusts in dark corners, cracks, and under appliances.
No, roaches will not automatically leave a clean house. While cleanliness deters them, roaches are ultimately driven by three basic needs: food, water, and shelter. Because they can survive for weeks without eating, a single leaky pipe or dark wall crevice is enough to keep them thriving.
To 100% eliminate roaches, you need to combine professional-grade gel bait with natural desiccants (like boric acid or diatomaceous earth). The best approach is to poison the colony while breaking their breeding cycle.
If you see a cockroach indoors, it is best to kill or remove it rather than leave it alive, as a single sighting usually indicates an active infestation. However, crushing them with your shoe can spread disease-causing bacteria and attract more roaches to the area.
To find a cockroach nest (harborage), you don't need to look for a traditional bird-like nest, but rather hidden congregations in warm, dark, and humid areas near food and water.
Cockroaches are most active during the spring and summer months. Because they are cold-blooded, warmer temperatures speed up their metabolism and reproduction cycles.
Roaches are primarily drawn out of hiding by the scent of food, moisture, and warmth, particularly at night, which is their most active time. To lure them out, use bait stations, sweet treats, or starch-based foods placed near dark, moist areas like under sinks or behind appliances.
To confirm roaches are completely gone, you need to go 2 to 4 weeks with zero live sightings, no new droppings (which look like dark coffee grounds or black smear marks), and empty glue traps.
To eliminate roaches overnight, use a DIY bait trap made of equal parts baking soda and sugar. Leave the mixture in shallow dishes in dark, damp areas before bed. The sugar lures the roaches out, while the baking soda acts as a lethal agent upon ingestion.
Squishing a cockroach releases harmful bacteria, scatters potential allergens, and triggers alarm pheromones that attract more roaches to the area. Because their bodies are incredibly tough, crushing them is highly unsanitary and ultimately worsens your pest problem.
There's no instant or overnight solution for a cockroach infestation, but there is one fix that's more effective than all the others: calling a pest control specialist. Because cockroaches are so difficult to kill and infestations are tough to control, it's best to rely on the pros to get rid of them.
Yes, Dawn dish soap and water can kill individual cockroaches on contact. The soapy water breaks the surface tension of water, clogging the roach's breathing pores (spiracles) and causing it to suffocate in under a minute.
Roaches multiply at an alarming rate. A single female German cockroach—the most common indoor species—can produce up to 400 offspring in her lifetime. Because their life cycle is incredibly short, a single pair can theoretically explode into tens of thousands of descendants in just a few months.
To eliminate roaches, focus on removing grease and food sources by mopping with a solution of water and mild dish soap, or a mixture of water and vinegar (which clears food odors and their scent trails).
Yes, cockroaches do go near sleeping people. Because they are nocturnal, they roam at night to hunt for food, water, and warmth. If a person is still and quiet, they may crawl over them.
Even though they're strong swimmers and climbers, most cockroaches won't make it back up through modern plumbing. Once flushed, they typically end up in the sewer system where survival is unlikely due to the harsh conditions and lack of food.
The number one killer of roaches is gel bait insecticide. Unlike traditional sprays that only kill bugs on contact, gel baits (like Advion Cockroach Gel Bait or Combat Max) use slow-acting poisons. Roaches eat the bait, return to the nest, and pass the poison on through their feces and dead bodies, effectively wiping out the entire colony.
A cockroach's biggest weakness is its total reliance on water.
Signs of a cockroach nest include small black pepper-like droppings, dark smeared stains, oily/musty odors, shed skins, and empty or full egg casings (oothecae) hidden in dark, moist, and narrow gaps, such as under sinks, behind appliances, and inside cabinets. Seeing live roaches during the day or high numbers of nymphs signals a major, established infestation.