I frequently see binoculars with lenses caked in dirt and grime. My wife sees camera lenses in similar condition. Worse, I see people pulling out a shirttail or a bandanna and rubbing on their lenses, ...

If you wear glasses, I’m sure that every time you buy a new pair the optometrist cautions you to only clean them with a soft lens rag. I always brushed aside their cautions. When you’re out ...