Ultrasonic cleaning and some brush cleaning with acetone may help of the issue is crud packed into the engraving. If that is not the issue then there is nothing that can be done since it is likely wear to the engraving or just lightly cut engraving.
I have had some frames that I swore would need engraving recut, but after the frame was annealed, everything looked good. As the annealing blew out all the crap packed in the engraving. Of course this is something that is only done if a frame is going to be re-colored.
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B. Dudley
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