Best way to polish iphone 4 metallic band

guyz, selling iphone person exclusively wants new metallic band around iphone 4 body..wat's best way this iphone has normal usage signs become visible when seen under light. member here tried before..just give me useful points..want make metallic band of iphone 4 new(or close) thnx

 

i have found thread if happen know other way this, plz post.
http://forums.macrumors.com/showthre...=polished+band

 

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