I have read that sonic cleaners will often clean the surface to such a degree that more of the case colors are visible. True, once they're worn away they're gone but, according to what I read, ofttimes there is more color under the surface grime than we think, and the sonic cleaner gets it off.
To be clear, I have not tried this myself, but it was reported to be completely safe for ccc actions. Before and after photos that accompanied what I read showed the obvious results.
Nice job on the light refurbishing.
SRH
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