Got an expensive binocular and can't decide what to use when cleaning it? Sure, you can use exotic chemicals, lens tissue and paper, lens cleaning cloths, just to name a few products, but my favorite is still a basic lens pen. A lens pen has a soft retractable brush on one end to remove particles from the lens and a squeegee for cleaning the lens surface on the other. The little, round, squeegee tip can reach places at the edge of a lens where fingers cannot push a lens tissue or lens cloth and, unlike liquids, there is no mess or chemicals to run into the binocular eyepiece lens mounts. Can't beat the price, either. When your lens pen is no longer cleaning, just buy another. I have used lens pens on cameras, binoculars, spotting scopes, magnifiers and telescope eyepieces and other small lenses for many years with great success.