To clean your lenses, we suggest using only Optica Omni cleaning fluid, which is available at any of our stores, and a lint-free cleaning cloth, which you can also pick up at any of our locations. For day-to-day cleaning of light smudges, a few swipes of this cloth should do the trick. Avoid using hot water on your lenses (especially if they are high-index lenses), as they can develop bubbles or cracks when exposed to high heat.