There are several home remedies that can kill cockroaches almost instantly. Here are some of the most effective ones:

• Boric Acid: Dust a little bit of boric acid powder in corners and floors where cockroaches are seen. When roaches come in contact with it, they die. However, boric acid is poisonous and should be kept out of reach of children and pets at all times.

• Baking Soda: Mix baking soda and sugar in a 1:1 ratio and sprinkle the mixture in corners and other areas where cockroaches are seen. Sugar acts as a bait to attract cockroaches, and the baking soda kills them.

• Peppermint Oil: Add peppermint oil to a spray bottle and dilute it with water. Spray the mixture in the places where cockroaches are most active in your home. This method is not an overnight solution, and you will notice a difference only after continuous application.

• Bait Stations: Bait stations are tubes filled with poison that attract cockroaches. When the roaches eat the poison, they die. The other roaches will eat the dead roach, passing the poison through the group.

• Soapy Water: Dousing a cockroach in soapy water will suffocate and kill it. Filling a spray bottle with dish soap and water, shaking it, and spraying a roach from above will kill it quickly.

Its important to note that while these home remedies can effectively kill cockroaches, they may not be a permanent solution. Severe infestations will likely require the help of a professional pest management team.