My late-2009, 21.5" iMac runs fine, but the temperatures have crept up over time. I'd like to open it up and clean out all the crap that is probably plugging up the intakes and/or fans. I've already tried vacuuming the intake vents and letting the fans run a while at max rpm, neither of which helped much. My problem is that I only have an upright vacuum cleaner that has no hose or attachments, so I'm a bit hesitant to try to use it on the guts of the machine. Does anyone have any tips or tricks? Compressed air? Garden hose? Also, are suction cups absolutely necessary for removing the glass? I don't like buying things if I don't have to.