The best way to clean your fly sunglasses is by using a cleaner developed especially for eyewear lenses, along with a lens cleaning cloth, or a premoistened towelette.

Improper care can damage sunglass lenses, resulting in scratches or haziness, which in turn may cause eyestrain.

To avoid damage, do not clean your glasses with paper towels or clothing, which can grind dust and fibers into lenses leaving scratches. Avoid using household detergents or soaps. While a few mild soaps don't harm lenses, today's extra strength soaps are powerful enough to slowly disintegrate lens coatings. Also avoid glass cleaners, which are highly corrosive and can damage your lenses quickly. They are not made for the nonglass lens materials used in sunglasses. While none of these products will do immediately apparent damage to your lenses, over time and with repetition the damage will become apparent.