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Zinc pretreatment

Hello,

I want to clean parts in zinc. What cleaning solution can I use? Same question about parts which were soaked in nitric acid, other parts soaked in sulfuric acid and other parts soaked in soda solution. All these parts are now grey-black and I want to give them metallic aspect.

Thank you for your help.

LEBOEUF Alain
- Asnieres, Hauts de Seine, France
2002

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