Newcon Optik NVS 6 - Manual (Page 39)

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3.3 Maintenance procedures
Operator maintenance of the NVS 6 is limited to cleaning the
system as follows:
CAUTION
The NVS 6 is a precision electro-optical instrument and must be
handled with care.
Do not scratch or touch the external lens surfaces.
Do not use abrasive materials to clean the gold-plated electrical
contacts.
Gently brush off any dirt using only a soft, lint-free cloth.
Moisten the cloth with fresh water and gently wipe the external
surfaces (except lenses) so they are free of foreign material.
With another dry, clean, soft lint-free cloth, dry any wet surfaces
(except lenses).
Using lens paper, carefully remove all loose dirt from the lenses.
Dampen a folded lens paper with clean water and lightly and
slowly wipe the lenses. After one straight stoke, discard the lens
paper. Repeat this step until the glass surfaces are clean.