How to remove urine from a polished brass surface and restore finish?
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Urine probably ate through the brass finish. If it's just brass coated then you'll have to get it recoated
The traditional answer is to use "Brasso", available in most stores that sell cleaning supplies. This site has more advice, things to try that may work just as well, depending on the shape, size, and condition of your brass:
https://www.diynetwork.com/how-to/maintenance-and-repair/cleaning/how-to-clean-brass
Correct. urine or acid is used to etch brass. consider etching the rest of it.