They wont look any different, shes basically gave them a salt water bath, because mixing bi carb with vinegar cancels each other out and makes salt water (but a massive cleaning account you think would know this)
Any jeweller will say to soak them in a warm soapy water bath and brush very lightly with something like a babies toothbrush so you don't catch the claws on the ring.
Also, she needs that hideous engagement ring re-plated, its as yellow as
duck!
And no Hinchers, I'm not jealous, my rings also need doing
Its seems white gold really doesn't like hand sanitizer