Comment by keane
3 months ago
The Spectacle Factory recommends, in order, (1) warm water and a microfiber cloth, (2) Zeiss lens wipes, or (3) an ultrasonic bath: https://www.youtube.com/watch?v=m4lJ_5Tg9Ms
They recommend (v=5FUUgO95sb4) against both detergent for the sake of the lens coatings and against sprays which may cause grease to accumulate around the lens rim.
If you're the kind of person who has bought a dozen pairs of cheap Zenni's... the lens coating gets visibly damaged every time I've used hand soap on them. I now just blast them with hot water and wipe dry with a lens cloth. I don't know whether hand soap is a problem for more expensive brands, but it definitely is for Zenni's.