The interior of a computer case with tons of dust on the fans and case.
(Image credit: Future)
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I don't remember the last time I actually took a duster to my own rig. But in my defence, I only recently upgraded my motherboard and that required I remove pretty much everything out of my PC in the process of ripping out an old ASRock mobo I could no longer trust in favour of an Asus. So, that basic action meant that I had cleaned my PC by proxy in the past couple of months, though without actively cleaning it.