If you are a cheapskate and don't want to buy canned air, use a bicycle pump or if you are lazy like me, the vacuum cleaner will suffice but be careful you don't scratch anything.
Bill makes note to self to retrieve the cooling fan from the vacuum bag and next time remove the power head from the vacuum
Yes Bike pump is ok if it does not spit out any grease. The dust usually dislodges very easily. Does not hurt anything except when it blocks vents etc
Actually I have recently switched to a sealed liquid cooling system they are very efficient and affordable. I just worry about what can happen in a few years time if I get a leak (well the cooling system I mean)
Bill D