The heading steals from the quotable quote from the first lady of the first Chief Executive of the Hong Kong Government at the time where SARS was rampent throughout the territory, "Bear, bear, bear in your mind; wash, wash, wash your hands." She was in over-extensively full protective gear as she was saying this while joining the cleaning team on a public hygiene activity, which become a laughing stock of the public.
But the stress should be heeded for both public hygiene and the longevity of the camera lenses.
Dusts can be defiant of every blow your make with a blower. Fingerprints, grease, unknown stains and whatnots can be extremely stubborn on the lens surface. After a longer period, the image quality can be underminded.
There is an old post from the archive tipping on cleaning a lens here.
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