K&F Concept Microfiber Cleaning Cloths - 10 Pack Lens Cleaning Cloth for Cleaning Camera Lenses, Glasses, Screens, Cameras, Eyeglasses, LCD TV Screens, Tablets Washable
SKU: SKU.1597
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I just hand-wash them in a gentle soap and they seem to be fine so far.
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Just says 100% microfibre but they are great.