what should i do, my headset became dirty white?

[philippinesjoy]

When i received my iPhone along with headset and charger, it;'s pure clean white. BUt now it's not as white, it's became dirty white (looks like light yellow). I don't what happened why it changes color. i don't know what should i do.

what can i do? :ipod:

 

[Del]

A barely damp mr clean magic eraser? Not really sure.