Natural methods of getting rid of cockroaches include using diatomaceous earth and catnip. Diatomaceous earth is a soft powder that causes insects to die, and catnip repels cockroaches. Either can be left in areas with cockroach activity to repel or kill them.
Diatomaceous earth kills cockroaches in 48 hours to two weeks. Cleaning is an important aspect of preventing cockroaches, because they are attracted to food residue. Cracks and holes should be sealed up to reduce the places where a cockroaches can enter the home. Cockroaches can be killed by spraying soap and water on them, because the soap suffocates them.