The acid concentration in vinegar / lemon juice isn't going to attack gold plate - its the medium which applies it - i.e it mustn't be rubbed in with anything abrasive like a pan scourer.
I'd give it a go with an old soft toothbrush, but if you like try this on a small area that you can hardly see.
John
I'd give it a go with an old soft toothbrush, but if you like try this on a small area that you can hardly see.
John