Ugh...I hate hardware.
Canned air, on the other hand, is fun. We keep LOTS of it on hand. Handy stuff, that.
My boss also discovered you get a cool ice sculpture effect if you turn it upsidedown and spray it with the nozzle submerged in a cup of water...
How, dare I ask, did he discover that?
As long as I don't have to do it too often, hardware's ok.
Underwater? Never tried that. I use to turn them over to frost my cans of Coke.