Rust remover: This might interest you guys

I use phosphoric acid.
I used to buy it as phosphoric acid, but now I scrounge Milkstone remover from the
dairy farm up the road.
 
Enlighten me. How does it work ok so it presumably dissolves rust but surely it leaves bright steel that is going to rust again.
 
Have used fresh lemon juice mixed with cheap white vinegar and sometimes a spoon of bicarb to clean up moderately rusted parts quite nicely.
 

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