We can use:

- mechanical polishing

- chemical polishing

Depends on what the "green" is. But I'd suggest a metal polishing compound.

Polishing oils are used to lubricate the metal as it is polished by a very fine grit wheel or cotton with embedded compound wheel. It is used most in mass production where the polishing of something such as a saw blade happens very quickly creating a lot of heat. The lubricant removes heat and prevents removing the temper of the hardened steel.

It is also used in consumer metal polishing compounds and wax such as aluminum polish, brass polish, silver polish and so on to prevent rust and oxidation staining and protect the metal from oxygen.

A polishing compound is a substance that removes by abrasion a small portion of paint, metal or other substance. Think of it as liquid sand paper, It comes in different abrasiveness levels, or cuts.

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