We've been using them on my daughter's glasses for two weeks. She was unhappy at school, her glasses fogged up when she wore a mask. These completely solved the problem. Every few days I wipe down her glasses with a microfiber cloth, breathe on the lenses to fog them up, and then wipe them down with one of those cloths. Once applied, they won't fog up again for a day. I don't know if we get hundreds of apps with a single wipe as advertised on the box. Two weeks later the first cloth is still holding up. Overall great price and very easy to use
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