More fan madness, from Norman, who took this photo after he'd unsuccessfully tried to get the crud off:
Mike Timbers wanted readers to know that water-cooling units need love too...
...and here's another from Rob Brown, halfway through the clean-up operation:
In case you're thinking it'd just be easier to bin the infected component, Erik Pearson offers hope. Here's an Intel Core 2 cooler, with the fan removed, before and after a vigorous scrub: