Sunglass lenses become dirty with daily wear, regardless of the type of finish on the lens. This is especially true when it comes to sunglasses. You’re always taking them off and putting them back on, so they’re bound to get smudged.
A common tactic for cleaning sunglasses is to moisten the lens with your breath and then wipe them with a shirt or napkin. Avoid this gross practice. Rather than helping, it can smear dirt spots and scratch your lenses. Here’s what you really need to know: