Steiner Optik 7x50 Commander Binoculars - Manuel (Page 21)

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storage
When not using your STEINER binoculars you should store
them in a cool dry spot. Avoid storage in spaces exposed
to direct sunlight (i.e. in a car) or with extreme tempera-
ture changes.
Cleaning
Clean your binoculars by wiping the rubber armoring with
a damp cloth. More stubborn dirt may require a light soap
and water solution on a damp cloth. Clean the lenses of
your binocular only when necessary and never use any
acid based cleaning solutions. The NANO Protection
Optics ® of your XP binoculars repels dirt or water to form
on the lenses - simply rinse with water or wipe the objective
or ocular lenses gently with the cleaning cloth that came in
the original box.