When cleaning outdoor optics, it pains me to see someone use their shirt-tail to clean scopes or binoculars! For years a box of cotton tipped swabs and a bottle of denatured alcohol have been mandatory camp-box equipment. The denatured alcohol will cut crud, oils and other contaminants, leaving the optics streakless, and the cotton-tipped swabs will not scratch the lenses or the optical coatings. It is cheap, effective, evaporates quickly, and preserves optical clarity.Once a lens is scratched, it never performs as well as it did before. The best bet is to treat them kindly right from the start!
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