Roaches thrive on food scraps, grease, and moisture, and your trash can is an easy meal if it's left unchecked. Roaches don't respect boundaries. A loosely tied trash bag is practically an open invitation, and even outside, roaches will squeeze their way in if there's the faintest whiff of food. Also, make sure you wash your trash bins with hot water and toilet bowl cleaner every now and then. Small habits like these might not seem like much, but together they can help you say goodbye to cockroaches.