Wet tissues aren't a good idea IMO! There are some of them out there that every now and then are too "agressive" and able indeed to completely fuck the coating! Not good! And sometimes it's just one of them out of a perfect box which is someway "fucked up". better not to use them and just use a microfiber one, usually there is not even the neet to damp the lense, but for some of the hardest job, you can do it too...
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