I would recommend using a teaspoon of reetha powder(found in any indian grocery store) in bowl of water for cleaning gold, silver, brass and copper ornaments and artifacts. It brings back the lustre and keeps it that way for almost a year.
If the grime is too much keep it in the bowl for overnight.
I would recommend cleaning jewellery with half vinegar and water in a cup with a few drops of lemon juice, I use this method to clean all gold, silver and diamond jewellery, I was told to use the method by a Diamond Expert and I can say it makes your diamonds and gold shine.
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