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Oxalic acid will get rid of the rust in minutes but you’ll be left with pitting, which will still need to be polished out. There’s a commercial product called Barkeeper’s Friend that’s mainly Oxalic acid with, I think, a mild abrasive. Hardly worth it for these small bits of rust but might be useful for a rusted cast iron pan from the car boot. I’ve also used HG limescale remover for getting rust off but that is mainly phosphoric acid and stinks.
GF's Okatsuna garden scissors are looking a little worse for wear. What would be the recommended fix? Bit of work with a stone and then some mineral oil?