I just purchased an older NightForce 3.5-15x50 NXS at an estate sale. It was apparently stored in a barn for a good long while. It is covered in fine dust and appears that condensation has "glued" the dust to the scope. I think the aluminum will be easy enough to clean. My question is how do I clean the glass without scratching it? I feel that standard cleaning cloths, wipes, cotton swabs would hold the dust and act as an abrasive.
Thoughts?