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Method C :  

Condition of lens : Moderate contamination (spittle, oils)              

Cleaning method :             

Use a new clean cotton ball or cotton swab.

Dampen cotton with acetic acid (or vinegar) with 6% acidity. 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.

Slightly wet the provided optical-grade rice paper with drops of Propanol/Ethanol (CP grade),

using a pipette, and gently pull the paper toward the dry side away from the element,

until there is no contact between them, until the residue of acetic acid has been removed.