We have some projectors that have a timer that causes them to request
cleaning every thirty days. That's a real pain on ceiling mounted units
that have to be removed for cleaning. However, we have opened some
projectors after a few years of use to find them totally clogged with
dust. This can get expensive when bulbs and LCD panels overheat. I wish
the projectors were better designed for ease of cleaning.  We use
regular camera lens cleaning supplies. I understand that some lens
cleaning brushes contain Polonium 210, the same stuff that did in
Litvinenko.  Bet it works great.
--Steve Barner


From: School Information Technology Discussion
[mailto:[log in to unmask]] On Behalf Of Raymond Ballou
Sent: Tuesday, December 05, 2006 1:22 PM
To: [log in to unmask]
Subject: cleaning projector lenses

Dear List:
Now that we have a number of projectors in the building, I have actually
started to pay attention to maintenance. We have no current issue, but I
foresee a day when I need to clean a lens. Most likely from dust
accumulation than from anything else.
We have a number of projectors here and they all says something a bit
different but it boils down to.
Deionized air
Lens cleaning paper
Dry soft cloth (for camera lenses)
Has anyone used anything else and had good luck, where does one get
deionized air?

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