How to restore copper patina?




I have a copper sink in my guest bathroom, the cleaning crew wasn't watching what she was doing and mistakingly put toilet bowl cleaner on the copper in a small section which took off all the patina, Help what can I do to restore the patina?? It looks horrible now
LJ
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Here are some tips on restoring copper sinks: https://cleaning.tips.net/T008399_Restoring_Copper_Sinks.html
http://www.howtocleanstuff.net/how-to-remove-chemical-stains-from-a-copper-sink/
https://www.diynetwork.com/how-to/maintenance-and-repair/cleaning/how-to-clean-copper
Howards makes a great copper polish: https://superiorpaintco.ca/products/howard-copper-and-brass-polish