Does anyone have any good suggestions for cleaning the internal fan on the top of an iMac G4? (preferably without disassembling the entire machine). Since I've had the iMac, I've noticed there is dust accumulation on the fan blades and while its not super loud, it does get annoying after 30mins - 1 hour use. I've talked to people and they said that these machines are supposed to be a lot quieter. Let me know your suggestions! Thanks.