how to kill roaches

15 Proven Strategies: How to Kill Roaches Naturally and Effectively

Cockroaches are a nightmare for many homeowners. Learn how to kill roaches and maintain a clean, pest-free home with these 15 transformative steps.

Preventative Measures: The First Line of Defense


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The most effective way to manage a roach problem is to prevent it from occurring in the first place. Here are detailed preventative strategies:

1. Sanitation

Good sanitation is paramount in keeping roaches away. Roaches are always on the hunt for food and water. By ensuring that your home is clean and devoid of easily accessible sustenance, you can make it less appealing to these pests. Make it a routine to wipe down counters, clean dishes immediately after use, and sweep or vacuum floors to remove crumbs.

Additionally, take out the trash regularly and ensure that garbage bins are sealed properly to prevent roaches from feasting on leftovers.

2. De-Clutter

Roaches love to hide and breed in secluded, dark places. The more clutter you have, the more you’re offering these pests a sanctuary. Periodically clearing out unused items, especially in areas like the garage, basement, or attic, can help in reducing potential hiding spots.

Also, be mindful of materials like cardboard, as roaches are particularly fond of them. Instead of hoarding old boxes, try to dispose of them or store items in plastic bins.

3. Inspections

Even if you haven’t noticed roaches, they might still be lurking around. Regular inspections can help you identify and address potential problems before they become full-blown infestations. Focus on areas that are most likely to attract roaches, like kitchens and bathrooms, where food and moisture are abundant.

Additionally, inspect the exterior of your home. Look for cracks, crevices, and other openings. Sealing these can prevent roaches and other pests from gaining entry.

4. Yard Maintenance

Your outdoor space can also be a breeding ground for roaches. Regularly cleaning and maintaining your yard can prevent roaches from establishing a base outside that could eventually lead to an indoor infestation. Keep your garden free of waste and debris.

If you have a compost heap, make sure it’s well-maintained and situated at a reasonable distance from your home. Additionally, properly manage your garbage. Ensure that outdoor bins are sealed and don’t overflow. Keep them as far from your home’s entrance as possible.

By consistently practicing these preventative measures, homeowners can greatly reduce the chances of a roach infestation and maintain a more hygienic living environment.

How to Naturally Kill Roaches


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Nature offers multiple solutions to keep roaches at bay.

1. Diatomaceous Earth

Diatomaceous Earth (DE) is a naturally occurring sedimentary rock that’s crumbled into a fine powder. It’s made from fossilized diatoms, which are tiny aquatic organisms. The microscopic sharp edges of DE cut through the exoskeleton of roaches, causing them to dehydrate and die. To use DE effectively:

  • Make sure to get food-grade DE, which is safe for humans and pets.
  • Sprinkle a thin layer in areas where roaches are commonly found, like under sinks, behind appliances, and along baseboards.
  • Remember, DE loses its effectiveness when wet, so ensure the treated areas remain dry.

How Long Does Diatomaceous Earth Take to Kill Roaches?

When roaches come into contact with diatomaceous earth, the sharp particles pierce their protective exoskeleton, leading to dehydration. The time it takes for diatomaceous earth to kill roaches varies based on several factors:

  • Level of Contact: Roaches that move through a heavy dusting of DE will pick up more particles than those passing through a light dusting, leading to a quicker demise.
  • Environmental Conditions: In more humid conditions, DE may take longer to desiccate roaches completely, as the moisture in the air can counteract some of its dehydrating effects.
  • Species and Size: As with many treatments, larger or more resilient species of roaches might take longer to die after exposure to DE than smaller species or nymphs.

On average, after coming into direct contact with a significant amount of diatomaceous earth, roaches typically die within 48 hours. However, it’s worth noting that DE continues to be effective as long as it remains dry, making it a long-term solution. It doesn’t lose potency over time like some chemical pesticides might.

2. Boric Acid

Boric acid is a common household item that can be a potent roach killer when used correctly. It affects the roach’s digestive system and outer shell, causing death. Here’s how to use it:

  • Mix equal parts of boric acid, sugar, and flour to create bait balls. The sugar and flour attract the roaches, while the boric acid kills them.
  • Place these balls in areas frequented by roaches.
  • Caution: Boric acid can be harmful if ingested by pets or humans. Ensure that it’s placed in areas where they can’t access.

How Long Does Boric Acid Take to Kill Roaches?

After a roach ingests boric acid, the substance begins to affect the insect’s stomach and metabolism, eventually leading to its death. Typically, after a roach consumes boric acid, it can take anywhere from 3 to 7 days for the roach to die. The exact duration depends on several factors, including:

  • Amount Ingested: A roach that consumes a larger quantity of boric acid is likely to die faster than one that consumes a smaller amount.
  • Species of Roach: Different roach species may react slightly differently to boric acid. While it is generally effective against most common household roaches, some might be more resilient than others.
  • Age of the Roach: Younger roaches, or nymphs, might succumb to the effects of boric acid faster than mature ones because of their smaller size and less developed systems.

It’s worth noting that while boric acid is effective, it should be used with caution. It must be placed in areas where roaches can access it, but children and pets cannot. Additionally, while boric acid has a slower kill time compared to some commercial roach killers, its continued effectiveness over time can make it a valuable tool in managing roach infestations.

3. Catnip

Surprisingly, catnip isn’t just for cats. Nepetalactone, the essential oil in catnip, acts as a natural repellent for roaches.

  • Place small sachets of catnip in areas where roaches are a problem. You can also simmer catnip in a small amount of water to make a “tea” and use it as a spray in roach-prone areas.
  • While safe for humans, excessive catnip can make cats overly excited. Keep this in mind if you have feline friends at home.

4. Essential Oils

Certain essential oils are known to repel roaches due to their strong scent and chemical components.

  • Peppermint Oil: Apart from its refreshing aroma, peppermint oil is disliked by roaches. Mix 10-15 drops of peppermint oil with water in a spray bottle and spritz in areas where roaches are commonly seen.
  • Eucalyptus Oil: Similar to peppermint oil, eucalyptus has a strong scent that roaches find repelling. Use it similarly by creating a diluted spray.

5. Bay Leaves

Bay leaves, commonly used in cooking, can also deter roaches without introducing harmful chemicals into your home.

  • Crush dry bay leaves to release their aroma. The scent, while pleasant for humans, is a deterrent for roaches.
  • Scatter the crushed leaves in cabinets, drawers, and other areas where you’ve noticed roach activity.
  • Replace every few weeks or when you notice the scent has faded.

6. Lemon Oil

Lemons and lemon oil aren’t just refreshing; they can also be potent deterrents for roaches due to their strong citrus scent.

  • To harness its power, mix 10-15 drops of lemon essential oil with water in a spray bottle. Spritz this in areas where you’ve observed roach activity.
  • Another method involves using fresh lemon juice. Simply add lemon juice to your cleaning water when mopping or wiping down surfaces. The lingering scent can deter roaches from making a comfortable home in your space.

7. Cucumber Peels

An old home remedy, cucumber peels have been said to be an effective deterrent against roaches. They dislike the scent of cucumber, making these peels a safe, natural repellent.

  • Place fresh cucumber peels in areas of known roach activity, such as kitchen counters, cupboards, or near entry points.
  • Replace the peels regularly to ensure the scent remains fresh and potent.

8. Soapy Water Spray

A solution of soap and water can be deadly to roaches. Soap acts as a surfactant, breaking down the roach’s protective waxy layer and causing dehydration.

  • Prepare a mixture of water and a few drops of regular dish soap in a spray bottle.
  • Spray this mixture directly onto roaches when you see them. The soapy solution will clog their pores, making it difficult for them to breathe, leading to their death.
  • This method offers a quick, on-the-spot solution and can be particularly effective against lone roaches or scouts that venture out in search of food.

9. Cornstarch and Plaster of Paris

This mixture is an efficient way to target roaches without resorting to chemical solutions.

  • Combine equal parts of cornstarch and plaster of Paris.
  • Sprinkle this mixture in areas where roaches frequent. Roaches are attracted to the cornstarch, but the plaster of Paris is deadly to them.
  • Once ingested, the mixture hardens within the roach, causing its death.

10. Garlic, Onion, and Pepper Solution

This potent blend acts as a deterrent due to its strong smell.

  • Blend one clove of garlic, one small onion, and one tablespoon of cayenne pepper with a quart of water. Allow this mixture to steep for an hour.
  • Add a tablespoon of liquid soap to the mixture.
  • Spray the solution in areas of roach activity. The strong smell will deter them from venturing into the sprayed zones.

Store-Bought Solutions


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While natural remedies can be effective for mild infestations or preventive measures, sometimes a stronger approach is necessary. Commercial solutions have been developed and refined over the years to target roaches specifically, making them a practical choice for many households. Here are some of the most commonly used store-bought solutions:

1. Roach Baits and Stations

These products combine an attractant with a slow-acting poison. Roaches are drawn to the bait, consume it, and then return to their nest, where they eventually die. As other roaches consume the poisoned individual or its excrement, the poison spreads throughout the colony. This domino effect can decimate a population quickly.

  • Usage: Place baits or stations in areas of high roach activity. Ensure they’re kept out of reach of children and pets.
  • Note: Over time, some roaches may develop resistance or aversion to certain baits, so switching brands occasionally can help maintain effectiveness.

2. Roach Sprays

Aerosol sprays can offer immediate results. They kill roaches on contact and can also deter other roaches from entering the treated area.

  • Usage: Directly spray onto the roaches or into their hiding places. Always use in well-ventilated areas and avoid inhaling the fumes.
  • Note: Over-reliance on sprays can lead to resistance in roach populations, so they’re best used in combination with other methods.

3. Gel Bait

Gel baits are similar to bait stations but offer more flexibility in application. They contain attractants and poisons and can be applied in cracks, crevices, and other hard-to-reach areas.

  • Usage: Apply as directed, focusing on roach pathways and hideouts. Replace or reapply as needed.
  • Caution: Ensure the gel is out of reach of children and pets, as ingestion can be harmful.

4. Roach Traps

These traps usually use a scent or pheromone to attract roaches onto a sticky surface, where they become trapped and eventually die.

  • Usage: Place traps in areas of known roach activity. Replace as they become full or lose stickiness.
  • Note: Traps provide a good way to monitor the size and location of roach populations in your home.

5. Insect Growth Regulators (IGRs)

IGRs disrupt the lifecycle of roaches by mimicking their natural hormones, preventing them from maturing into breeding adults.

  • Usage: Follow the manufacturer’s directions, usually involving placing the IGR in areas of roach activity.
  • Note: IGRs can be an essential tool in long-term roach control strategies, especially in combination with other methods.

How to Kill Roaches in Your Car?


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Discovering roaches in your vehicle can be both shocking and unsettling. These pests can hitch a ride in grocery bags or migrate from a nearby infested area, turning your car into a new home. Here’s a detailed guide on how to get rid of these unwelcome passengers:

1. Thorough Cleaning

  • Vacuuming: Start with a thorough vacuuming of the entire car, ensuring you reach every nook and cranny. Use attachments to get between seats, under mats, and in other tight spots. This will not only remove roaches but also their eggs and food particles that might attract them.
  • Detailing: Consider a full car detail to ensure that all potential food sources and hiding spots are addressed. Focus on the upholstery, mats, and areas under the seats.

2. Bait Stations

Strategically place roach bait stations in various parts of your car. These baits attract roaches, who then carry the poison back to any nesting areas, killing off other roaches.

3. Diatomaceous Earth (DE)

Sprinkle food-grade DE in areas where you’ve noticed roach activity. The microscopic particles in DE can pierce the exoskeleton of roaches, leading to dehydration and death. After a few days, vacuum up the DE along with any dead roaches.

4. Maintain a Food-Free Environment

One of the primary attractants for roaches is food. If you’ve been eating in your car, even occasionally, there might be crumbs or food particles that you’ve overlooked. Ensure that you clean up immediately after consuming food in your vehicle, and if possible, try to avoid eating inside the car altogether.

5. Use Natural Repellents

Essential oils, like peppermint or eucalyptus, can act as natural repellents. Add a few drops to a spray bottle with water and lightly mist your car’s interior. Alternatively, place a few drops on cotton balls and leave them in the car overnight.

6. Inspect and Clean Regularly

Set a schedule for regular car cleaning. This will not only help in ensuring that the roaches don’t return but also in spotting an infestation early if they do.

7. Parking Locations

If possible, try not to park near garbage bins or in areas known for roach activity. Roaches can migrate from these areas into vehicles, especially if they sense food inside.

Dealing with a Major Infestation


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1. Recognizing the Severity

Before taking any action, it’s crucial to accurately assess the extent of the infestation. A few roaches might be stray invaders, but seeing them regularly, especially during the day, can indicate a more severe problem.

Roaches are nocturnal; daytime activity often suggests overcrowding in their nesting sites. Evidence like roach feces, egg casings, and a distinctive musty odor can also signal a large-scale infestation.

2. Thorough Cleaning

Even the best extermination methods can fall short without proper sanitation. A major infestation requires a deep clean. Ensure that all food sources, including crumbs, spills, and even pet food, are removed or securely stored. Vacuum regularly, paying special attention to hidden areas like underneath appliances or furniture. Empty and clean cabinets, especially in the kitchen and bathroom, where roaches often nest.

3. Isolate the Affected Areas

If certain areas of your home, like a particular room or section, are more heavily infested, it’s beneficial to isolate them as much as possible. This can prevent roaches from spreading to other parts of the house. Seal off these areas, treat them intensively, and regularly inspect for signs of movement or further infestation.

4. Combined Treatment Approach

When dealing with a large-scale infestation, relying on a single method rarely yields the desired results. Instead, a multi-faceted approach is more effective. This might involve combining store-bought solutions like gel baits and IGRs, using natural repellents in tandem, and even considering professional services if the problem persists.

5. Continuous Monitoring

After taking initial measures to combat a major infestation, continuous monitoring is crucial. This ensures that the population is indeed decreasing and helps identify any new or persistent problem areas. Regularly inspecting traps, checking for signs of roach activity, and even using baited sticky pads can provide insight into how well your efforts are working.

Addressing a significant roach infestation can be a daunting task. However, with perseverance, a systematic approach, and the combination of various treatments, it’s possible to reclaim your home from these resilient pests.

Aftercare: Ensuring Roaches Don’t Return


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1. Regular Inspection

Even after the apparent end of an infestation, it’s critical to remain vigilant. Carry out routine inspections of your home, especially the previously affected areas. Look for signs like fecal droplets, egg casings, or any live roaches. Consistent inspections can help you catch any resurgence early, making it easier to address.

2. Maintaining Sanitation

Cleanliness is a significant deterrent to roaches. Ensure that your home remains clean, particularly in areas like the kitchen and bathroom. Regularly take out the trash, wipe down surfaces, and sweep or vacuum floors. By removing potential food sources and making the environment inhospitable, you reduce the chances of a return infestation.

3. Seal Entry Points

Roaches can enter homes through surprisingly small gaps and cracks. To prevent their return, thoroughly inspect your home’s exterior for potential entry points. Seal cracks in walls, gaps around windows and doors, and any other openings with caulk or other appropriate materials. Also, check places like where utility pipes enter the home, as these can be common entryways.

4. Store Food Properly

Roaches are always on the hunt for food. By ensuring that all food items in your home are stored correctly, you can deprive them of this attraction. Use airtight containers for pantry items, refrigerate perishable foods, and never leave food out overnight.

5. Use Preventative Measures

Even after an infestation is under control, continue using some of the preventative methods that worked best for you. This might include natural repellents, occasional use of roach baits, or even IGRs to interrupt their breeding cycle. By maintaining a level of defensive action, you can help keep roaches at bay.

After successfully dealing with a roach infestation, the last thing anyone wants is a recurrence. With proper aftercare and preventive measures, you can significantly reduce the likelihood of these pests making a comeback in your living spaces.


Now armed with these strategies on how to kill roaches, you’re ready to reclaim your home. Remember, consistency is the key to a roach-free environment.

AboutCorinne Switzer

Corinne is an avid reader and takes a keen interest in conspiracy theories. When not busy with her day job, she likes to indulge the writer in her and pens columns on a wide range of topics that cover everything from entertainment, healthy living to healthcare and more.