It's a 2 stage process. First, you gotta get the grit off. But, if you rub the lens with a tissue or something, you rub the grit on the lenses, scratching them.....
So, your first step is a lens brush to gently brush the grit off. You can get compressed air cans in a camera shop to do this, too.
(DO NOT use your shop compressor- that isn't filtered sufficiently, you'll blow grit ON the lens)
OK, stage 2 is to get the film, grease, etc, off. Leupold and Burris (and I'm sure others) sell a lens pen with a brush on one end and some solvent you can use on the other end. Or, go to a camera shop and get some lens cleaning tissue and lens cleaning fluid. Put a drop of fluid on a tissue and GENTLY wipe the lens. If the fluid doesn't evaporate by itslef you can wipe GENTLY with a dry tissue.
Some lens cleaning stuff you see for cleaning eyeglasses will work, too
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