[quote name='Jazzneck' timestamp='1450725423' post='2935292']
Yup, it comes with age and that's why I like nickel.
If you want sparkly try cleaning them gently with Duraglit - follow the instructions on the tin.
Do not rub hard as the Duraglit is abrasive and may rub off the nickel plating.
[/quote]
If I understand correctly, jewellers' rouge will do the same thing, but rather more gently. Where you get it, and how much it costs, I don't know.