Martin, I do not know what the "best" method is to derust ferric material, I only know what i have been using for about 70 years now, & that I find to be unfailingly satisfactory, & that is vinegar. I believe the complete method has been put into this Forum a number of times, so I will leave it at that.
However, if you do use the vinegar soak method, it is probable that you will lose those last remaining little specks of gold. This would not concern me at all, but it might possibly concern you & some other people.
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