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<p>[QUOTE=&quot;2manybooks, post: 393432, member: 8267&quot;]sabre123 is correct. All such scientific instruments were originally lacquered to protect the metal from corrosion. The fact that there is so much corrosion indicates the coating has broken down. Cleaning and repairing the damage is a major undertaking. You might be able to improve the appearance with a bit of mineral spirits on cotton swabs. Using any kind of polishing compound is more problematic, as you need to be sure to remove any polish residue. If left, it can cause further corrosion. Do not use vinegar. It is acidic, and if it gets down into the nooks and crannies you could be causing more trouble. </p><p>Ideally, the instrument would be disassembled, and each part carefully cleaned and re-lacquered.[/QUOTE]</p><p><br /></p>

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