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Method A:           

Condition of lens : Dust or small loose particles on the surface     

Cleaning method :            

Use a small air bulb to gently blow off dust and debris. Do not use compressed air from a compressor as it is not a "clean" source of air and can contaminate the surface.

Gently place the provided optical-grade rice paper on the optic element. Slightly wet the 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.

**If this method is not successful, proceed to Method B