Cleaning rust on tinted concrete

I manage a home on the ocean and rust is a problem.

The home is finished with a tinted concrete so I am not sure what product I can use to remove rust spots and not change the color of the wall.

Any recommendations?

F9 or OneRestore

I think there are other more important problems going on there. Indoor light switch outside??

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that was my first thought, those screws dont look stainless either, makes for good repeat business i suppose