TLDR: These cloths have done me tremendous good. Over the past two or three years I have tried different lens tissues to see which ones work best for my needs. I hate dirty glasses, but since I wash them so often, I really need a product that won't scratch the lenses when I use it. Most brands excel in this regard, but there's always a compromise: some are so soft they leave paper lint (which obviously isn't ideal for clean lenses), some leave cloudy/streaky cleaning marks, and some just aren't on enough Cleaner to stay wet while cleaning both lenses. These are problems that I hardly ever have with these cloths (optics). The wipes don't scratch, the cleaner leaves no streaks/mist and I almost never have to open a second pack of wipes to finish the job. I typically go through each order for about 34 months, and while they get a little less soggy during that time, I've never gotten to the point where the unopened bags have dried up. If I had to guess, I would estimate around 12-18 months for the packs to be completely dry, but I would recommend ordering sizes that you can use for 6-8 months for best performance.
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