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Here the official reply from nVis, the company that makes the nVisor SX:
We include some cleaning cloths with all nVisors. the customers can buy more of those, or any high-quality lens cleaning cloth. these are to be used on the outer surface of the eyepieces only. If spots remain, there is most likely some debris inside the optics and the unit may need to be returned. let me know if this helps.
NVIS, inc.
Tel +1.703.891.1130
Fax +1.703.891.1135
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