I recently tried to clean a stainless dog bowl with toilet bowl cleaner/lime and rust remover (dont ask), which is mostly hydrochloric acid, I think. It turned the bowl a blackish blue where it touched, but it was pretty uneven. It didn't wash off though, even after scrubbing with steel wool. I haven't seen any rust on the blackened surfaces either.

I'm not making any suggestions, just reporting an observation.

FWIW

tq

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