Professionally polishing brass employs big tools at high speed and various compounds. The dust given off is awful and a respirator should be worn, nothing less.
Once polished, various clear type finishes can be applied to hold it in that or near to that condition.
I worked in a specialty metal fabrication shop welding such items and installing them.
All of the polishing staff worked their behinds off under awful conditions, I am happy I fabricated and welded and installed and didn't do that work.
Polished brass can look wonderful for years but costs large to get it like that.
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Robin Craig
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