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Ok, back from work. Without giving up our trade secrets, you can try using Daraclean, Oakite or a Nitric acid solution. (Insert standard disclaimer here.) Ok, if you know how/where to get nitric...

The NaOH trick probably works, sanding works (wear a good quality mask/respirator, I wouldn't suggest "just" a wood type dust mask, this kicks up very small particles). I think what we do at work to...