welcome Tom
looks OK to me - unless the piccys do not show the problem properly - what leads you to think that the surface has deteriorated?. there are a couple of spots/bit of dirt, but there still looks to be a good metal covering overall. Provided it still gives good views, leave as is - unless it is going to niggle at you that it isn't quite perfect.
It is a bit misleading to shine a light onto a mirror - you can easily see the light scattered from all the small defects, whereas the vast majority bounces off as normal and you have to avoid looking at the main beam because it is so bright.
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