So I'm getting the feeling my temps are running higher than before, and it's been a bit over a couple of years since upgrading the CPUs and using Arctic MX-2, which I think has that sort of service life. Just did a quick dust-out, and there's a fair few dust bunnies hiding in the fans, including the cooler block fans, also the CPU board has a fine film of dust that's got a tacky adhesion to the board. Most of it is gripping on hard enough that the can of compressed air can't dislodge it. What's the best cleaning product? Isopropyl? I recall someone posted a nice restoration thread with a careful clean recently, is there anywhere that shouldn't get "wet" during the cleaning?