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Question:

How to remove the metal oxide?

Clothes on the metal buttons and metal ornaments for a long time there will be a layer of oxide, looks bleak, what good way to make these metal accessories smooth shiny?

Answer:

Reduction with hydrogen (heating)
Brush with vinegar or toothpaste
Brush with a toothbrush brush try
Scrub with toothpaste, very effective oh ...

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