[sharkbite]

Howdy y'all...

I have a 4yo GSO680 that has not seen much use lately.
It sits inside the house with the covers on.

A rare still night had me trot it outside, when i noticed
something on the edges of the mirror.
(Please see photo)

The red arrows point to what looks like a whitish film
around the entire outer edge of the primary.

i was hoping someone could tell me what it might be,
and what i might be able to do to correct it?

cheers,