I've also noticed this, and I can't really say that I've found a solution to it. I usually just clean it with a wet cloth (I won't expose it to running water since I tend to have some bad luck with these kind of stuff ) and then use a needle to pick the most annoying tiny stuff that'll get stuck in the "cracks".
You know what works really good and nobody thinks about it? A simple sheet of paper.
But hey, I wash it like twice a day and that's the best way to clean it.
I even used a brush (like the one you use to clean your nails) to clean the "cracks".
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