One of the easiest ways to clean glasses is to use a lens-cleaning spray. First, use a microfiber cloth to wipe away any dust ...

and most have plastic lenses, which scratch more easily than glass. Clearly, you need to protect your investment. But should you clean lenses with tissues or cloth? When they're wet or dry?

Join 7 million other satisfied buyers and toss the smudge- and streak-creating cloths and sprays once and for all.