Any surface of any device, one way or another, will eventually wear out: dirty, there are scratches, microscopic cracks, etc. Therefore, when buying the device, and furthermore, an optical instrument, special attention should be paid to care for optical surfaces. This is especially important for devices used in harsh environments. Hunting and tourism Optics: scopes, binoculars, range finders, rifle scopes and instruments night vision goggles. Linkedin is full of insight into the issues. Typically in a production cleaning of optical surfaces produce cotton swab dipped in alcohol-ether mixture (vodka is also suitable quality – tested practices). Sometimes used acetone. At say using an optical sight in the field provided napkins that come with a parting.
But they are desirable before use to wash the soap, to get rid of excessive pile (often remains out of production), as the latter can easily stay on the wipe. Before wiping the glass is recommended for air. If there are grains of sand and dust, necessarily knock off with a soft brush with a soft, no matter what, God forbid, do not scratch the glass. Now the market offers and special facilities to care for optical elements devices (optical sights, binoculars, rangefinders, night sights). The first thing to mention special pencils for optics cleaning. With their well-removed grease stains, fingerprints, stains, dry the lens. Provided, and special chemicals to clean the optics for both winter and summer. Sight