Hi Zander..
Correct me if I'm wrong..but does the lightish residue has a swirl pattern when you shine a light on it?..the reason I ask is that the mirror on my 10 inch saxon developed a hazy swirl pattern on it's surface and you'll notice it only in direct light..but as I've found...this condition hasn't degraded the image.
A simple test for the mirror's reflective coating is to hold the mirror up to a lightbulb and if you can see the structure of the lightbulb's filiment then it might need a reacoat..or test it's image quality against another mirror of the same type..
Have a browse around for other advice..plenty of it in this forum!!
Cheers!
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