Diatomaceous earth is a white powder made from the fossilized remains of diatoms, which are a type of algae. It's found in many common household products, and if you buy food-grade diatomaceous earth, it's safe for pets and people - but not for roaches, as the powder destroys their exoskeletons. Thoroughly clean your apartment and clear or seal up any possible roach food sources like crumbs, trash, or easily accessible pet food before applying a deterrent.
Sprinkle light layers of diatomaceous earth where you've seen cockroaches. Roaches will also take the bait back to the nest to feed others, fighting your pesky pest problem at the source.
For a DIY method that can boost more proactive measures, cockroaches are generally averse to eucalyptus and lavender. Although eucalyptus and lavender smell pleasant to humans, they can be harmful to roaches.
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