On Mon, 28 Dec 2009 19:16:11 +0000, Dave Osborne wrote:
No disrespect to Harry, but generally speaking, you should not clean a
computer with a domestic airline, as the airline will most likely
contain water vapour and may contain oil and grit - none of which are
good for the innards of a computer.

Potentially. Ditto with vacuums which (depending on setup) might have
static issues; if using a vacuum then someone else's comment about using a
brush to brush dirt toward the nozzle is a good one.

I normally wash PCBs. Warm soapy water followed by 'flushing' with
distilled water. Leave to dry somewhere warm for several days afterwards.
Remove any fans first, because motor housings make for great water
traps... the long drying time makes this unsuitable for some
situations, but it works a treat...