Took a while to attempt this.. I was somewhat successful using dish soap warm water (140 degrees) and a makeup brush. Thus far without damage.. These are all somewhat recent purchases, the clock had obviously been stored in the open, real dusty. While it did clean up pretty well, there are some slight surface imperfections which I don't think additional cleaning will help with.
The tach appears as if a prior owner attempting some cleaning, leaving some marks and grime. I have gone over it several times, wash, rinse (warm water as well) and dry with a can of air. I need to work on it some more but it is looking a lot better.
I am not seeing a downside to the attempt..
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