Bugs are water repellant and the surface tension of the water means that the holes are too small for water to seep in naturally.
Fun fact if you want a really effective insect killing spray you can use WD40. It’s a penetrating oil meaning it will seep into even those small holes in their body and kill the insect pretty much instantly.
Warning: WD40 is poisonous and I wouldn’t recommend breathing in any of it or spraying it where kids and pets can get at.
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