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Citric acid is better. All acids both dissolve and create rust. Citric acid has the best ratio of the two. It's cheap too.

Actually though use CLR. It's literally designed for it.

Like, pour vinegar in bottom or fill up a five gallon bucket and soak it? I have that much vinegar at the moment but it seems like a lot. I was thinking sand blaster and a fresh coat of paint, but I'm fuckin stupid when it comes to this shit.

Project farm has done a test on various rust removers and vinegar was shit

Buy evaporust and be done in 12-24 hours.

After that paint it

The problem you have to be aware of is that it strips everything off of the metal including any galvanizing or protectants and leaves a dark but soft patina on it. You then have to buff that out and prime it before it starts microscopic rusting. Which, okay, you have that problem anyway.

Or OP could use sand or dry ice blasting to strip it all off.

In any case, use a rust inhibitor primer and then a good stout enamel paint like you would use for wrought iron.

Any good restoration channel on youtube will show the process and list materials worth using (stay away from the major brand name shit in the US because they suck compared to what you can get in England).

So does electrolysis. Electrolysis is going to target the metal because the rust is no longer conductive.

This is why I said use citric acid else where. Dissolves more rust. Dissolves lest metal.