So, I'm back from a trip to the Swiss Alps, and during the process of cleaning the sensor glass, I notice this:
When the sensor glass is clean and dry, it's pristine.
When I breathe onto the glass, I can see spots. Given that the moisture is on the surface of the glass, I'm guessing that these spots exist ON the surface facing out (if the spots were on the underside of the glass, the moisture from my breath shouldn't reveal it)
Is this something I should be concerned about? Is there a way to clean this? These spots do not show up on any of my images.