I suspect the screens are not machined at all. They are probably stamped or
moulded
from a glass or metal master much in the same way as CDs are made. That must
be why
they are plastic and not something harder and more durable.
I think any form of cleaning should be by a means which does not involve
anything
rubbing over the surface. Lars' suggestion of ultrasonic cleaning is
excellent.
Take your screen to your local jeweller with some distilled water to clean it
in.
I have another suggestion. There is a non abrasive lens cleaning product
called
Opticlean. It goes onto an optical surface as a liquid. It then semi
solidifies to
form a skin which traps all contaminants including fingerprints, grease and
dust.
The skin is then peeled off leaving a clean surface.
I haven't yet used this stuff myself but will get some soon. I think it would
also
be a safe method for cleaning front silvered reflex mirrors also. It is
available
from Jessops in the UK and is thought by some to be quite expensive but if it
will
allow one to clean lenses, filters, mirrors and screens safely it might be
worth it
when one considers the potential cost of damage to any of these.
Giles
Garth Wood wrote:
> I've wondered the same thing. The only thing I can think of is that the
> screens are made out of a
> relatively soft plastic which allows for extremely fine-toleranced machining.
> If it's as soft as I
> surmise, then even a light cleaning with the wrong tools or methods would
> scratch it irreparably.
>
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