I'd say a decent vacuum cleaner would be a good choice for cleaning there. The AlBook's holes aren't that different (if at all) from a MacBook Pro's so the stuff that gets through can't be too big. I think compressed air could be a bad thing though, because you could damage the speaker cones-and they aren't what you'd call bullet-proof. A "NORMAL" vacuum cleaner with a furniture attachment on the hose (the round brush with soft bristles) should be fine though, because it can't apply too much suction due to the air passing through the brush bristles.