Never wipe dry or dirty lenses with a dry cloth.
Using watchmaker's blower (item 4, WP 0046 00), blow as much dust and dirt
as possible from the exposed lens surface. Using artist's brush (item 6, WP
0046 00), brush across the surface with light, quick strokes, flicking after
each stroke to dislodge the dust it has picked up. When all visible particles of
dust and dirt have been removed, moisten a piece of lens type paper (item 10,
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