Doors and windows deserve the same scrutiny. A damaged door seal or a window with a worn gasket can let pests in just as easily as an open drain. Inspecting and sealing these gaps — with fresh caulk, weatherstripping, or appropriate sealant — addresses routes that no drain cover, balloon or otherwise, would block.
If insects keep appearing despite surface-level fixes, the source may be hidden deeper in the home: a plumbing leak inside a wall, an established infestation in a cavity, or a moisture problem that has gone undetected.
Regular drain maintenance still matters — but it replaces nothing else
The drain itself is not irrelevant. Cleaning away organic buildup and making sure plumbing traps are functioning properly are legitimate parts of bathroom hygiene and can reduce conditions that attract certain insects.
What a balloon cannot do, however, is repair a leak, lower humidity, or close a gap in the wall. As the source puts it, “The most effective solution is rarely the cleverest-looking hack.”
Lasting pest prevention in a bathroom comes down to keeping the space dry, maintaining the plumbing, and systematically sealing every credible entry point — a less satisfying answer than a balloon, but a more durable one.
