First of all, there's a chance the average new owner is going to think that blowing with one's breath is the way to go, inadvertently adding moisture. Blowing by mechanical device has surely got to be the better way.
Also, why blow dust around when you can get a mini-vacuum in there and remove it for good? I mean as long as there's no loose, vulnerable, broken parts, I'd tend to think vacuuming in most areas would be preferable. That said, I'd think you'd want to avoid sticking a strong vacuum directly on EM relays and that sort of thing.
seems like we discussed it in some length at one point and came up with the current arrangement, but I don't have a strong opinion on that stuff. the one thing I do like is that I can clear out weaker tables from the main section without deleting them
also, just to be clear-- the issue with "unapprove" is that you don't know if the table actually gets deleted from the server, right? AFAIK I have no way of seeing where the tables actually lie on the server, so it's something I can't test effectively