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I'd use the biggest smooth file I could get. Put a bit of duct tape on the file, and you can use the pin at the far end as a guide to keep it in line with the length of the scale. The pin lightly...

I'd say see what soap, water and nailbrush do, and if necessary use a mildly abrasive polish (even metal poiish) on a bristle (not wire) brush. If it is a rotary brush choose a small one, so it...