After special treatment, the advanced anti-fog lens cloth can prevent water vapor from condensing on the surface of optical products, thus greatly reducing the formation of fog and achieving the effect of anti-fog. Precautions. 1. When the lens cloth is not in use, it is recommended to put it in the bag to prolong its service life. 2. The effect can be maintained for about 24 hours after wiping once. 3. Please do not wash the anti-fog cloth, because the anti-fog effect will be ineffective after washing. 4. Please keep it out of the reach of children.