Copper oxide (green) on brass valve surface; What processing good processing method is there?

1. In addition to dissolved copper oxide with dilute acid,

2. If it only involves the surface, it can be polished and derusting with fine sand skin.

Note: the first way must be the residual acid wash clean, otherwise the brass surface can not keep long, and will change color; In addition, these two ways have destroyed the original surface anti-corrosion measures, so anti-corrosion measures must be treated;

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