A

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Method B :          

Condition of lens : Fingerprints, oil, other visual contaminants     

Cleaning method :            

Use a new clean cotton ball or cotton swab.

Dampen cotton with Propanol/Ethanol (CP grade). The cotton must not be dry.

Slowly and gently wipe the element in a regular pattern. Do Not scrub the surface (scrubbing might damage the coating or the element itself).

Gently wipe element in "S" motion.

If the surface is left with wipe marks, wipe it at a slower rate. When finished no streaks should be visible.