GPO USA 6-24x50 Passion 4X Riflescope (MOA Ballistic Reticle) - Manual (Page 34)

Care, cleaning and maintenance
You can clean the optics of your product with the optical micro-fib-
er cleaning cloth provided with your product, or by using other lens
cleaning equipment solely intended for optical cleaning purposes.
Be sure to keep the optical surfaces clean and immediately remove
any dirt or oil debris caused by grease (finger prints), oil or water
spots to guarantee consistent optical quality.
To clean the exterior lenses of your product, be sure to first remove
any granular dirt or debris that may cause scratching during the
cleaning process. Be aware that rough granular dirt particles must
be removed with either an air bellows or a clean hair brush. Other-
wise, this may lead to damage of the optical coating or scratches
on your lens.
Once large debris is removed, slightly breath onto the optical
surfaces to create a damp fog, then use the dry optical cleaning
micro-fiber cloth provided to clean the lens surfaces.
All other outside mechanical parts can be cleaned with a normal
soft, clean and slightly damp cloth.
This micro-fiber cloth must remain free of any physical granular
debris.