The Smith Smudgebuster is a microfiber lens cloth for cleaning glasses. It’s meant for eyeglasses, sunglasses, and goggles. Use it to wipe off fingerprints and grime and keep lenses clear. Smith positions it as a smudge-free, streak-free cleaner, so it’s a simple add-on if you fish in spray, sweat, or sunscreen and want a quick wipe between spots. This is a cloth only. It’s not a liquid cleaner and it won’t help if you need scratch repair or lens replacement.