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Bintel cleaning fluid is the best cleaner I have used. Get some cotton puffs and some white unscented tissues.
Use a hurricane blower to blow off loose grit and lint. Then daub fluid on the lens to get loose grit off. Now wipe with one tissue one 1.4 of the lens and turn over the tissue (never wipe twice) and then use another tissue. Once wiped it may have grit on it and a second wipe could scratch.
Wipe any minor streaks away and blow off any remaining tissue lint.
Greg.
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