Zeiss Dimension Manuel D'utilisation page 26

Lens care tips
To ensure that your lens is always in perfect condition, you
should prevent any form of dirt or moisture on the surface of
the glass. Dust on the lens can be removed carefully with a
soft brush; marks and fingerprints with a soft, dry and clean
US
microfibrer cloth.
To remove stubborn dirt, we additionally recommend the use
of the ZEISS cleaning fluid.
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