You don't have take your projector down from it's ceiling mounting bracket. If you have a vacuum that's hose is long enough to reach from the floor (or prop your vacuum on a ladder for that matter...) and a flat vacuum attachment, you can do it mounted. Unless your bracket is different than mine (I have the standard Sharp) the bracket allows for a space between it and the projector; just manuever the flat vacuum attachment between the two.
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