i use a bit of coiled ducting and a plastic drink bottle, cut in half with the ducting taped between, to make a set of bellows. it has enough umph to shift the dust out of the psu.
i believe the nozzle becomes statically charged when it sucks up things, especially things with a lot of edges like dust/ hair. if your lucky enough that the nozzle is made out of metal you can just earth it every so often though.
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