To understand why this trick works, it helps to know how cockroaches travel. They often move through pipes and tiny openings, taking advantage of damp areas where they can hide easily. The balloon method helps narrow the drain’s entrance, making it harder for roaches to crawl through. To try it, remove the drain cover and cut both ends off a standard balloon to create a stretchy ring. Slide this ring around the edge of the drain cover so it forms a tight seal when placed back in position.
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