Stay away from muricatic acid..
What you need is phosphoric acid..
I make repro No.4(T) chests and have to clean the coating off the slotted screws before bluing them and have been doing it for years.
Canadianicon tire or most of the paint shops sell rust remover and just make sure it is phosphoric acid.
You can also buy the powder at the drug store.
Nothing better than a spoonful in the dishwasher to clean it up and also get that iron ring out of the toilet...the wife will love you for it.
It is the taste in Pepsi cola by the way and you can find food grade on amazon....
Also...ready for this..Kosher
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