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Grease
These binoculars are about 40 years old and the grease seems to have had better days. I intend to clean the focusing mechanism with turps or something of the sort and then use the special Lithium grease I purchased from eBay, sparingly, only on the parts that are supposed to move freely.
The vendor sells various specialised greases and this one is marketed as intended specifically for optical and camera applications due to its long life, lack of volatile fractions that would vaporise and deposit on optics, and mechanical stability (i.e. no tendency to separate and run). The spiel might be BS, but as best I can tell and assuming the ad is not all lies, it's the stuff you want when you're greasing optical equipment!
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