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This guide was unbelievably useful, my G6 was heating up to 80+ degrees under light loads and turning off due to overheating, I was about to write it off, thought I might as well try this.
Once you get to the last step, it is possible to partly remove the fan (it stays attached at one corner) and clean out the gap between the fan and the bladed thing that looks like a barber's hair clipper.
That for me was full of a thick cake of dust, now that's gone the computer stays at 50+ degrees, and the battery life is massively improved (I was getting about 20 minutes due to the fan) and the fan is no longer louder than the speakers. Thanks uploader!