A mix of metho and water is fine for windows. We use it at work when the kids' have used up ALL the window cleaner! (which they just LOVE to do). At home, I just use white vinegar in a spray bottle.

I vac all the loose dust bunnies off the top of the ceiling fans. I haven't cleaned them more than that I'm afraid. The bathroom fans, I pull the covers off (after again using the vac for the loose stuff so it doesn't all fall on me), then wash them in the laundry trough.