We got a new furnace today and during the replacement, soot got everywhere. My PowerMac G4 Digital Audio was running the entire time, sucking and blowing the soot (you couldn't see it, but it did happen). My white Apple keyboard and Mighty Mouse are grey as well. Any tips for cleaning it out? I wiped off one of the HDDs, and it had some soot on it and I'm a bit paranoid about the cleanliness of my computers. My Mac mini (mid-'07) was also running for the entire time, although because it only has the exhaust vent I'm not as worried, but if you've got tips for cleaning that, I am looking for an excuse to open it . Thanks. PS: I'll probably open and clean everything that has either slats on the top or a fan to bring air in that was on.