Has anyone got any tips on how to make the grey body trim on the S40 look new again?

I am guessing back to black isn't the answer and I don't think they do a back to Grey or maybe even Away to Grey?!

I polished the car for ages the other day and it was gleaming but the grey looked really lifeless and kinda spoiled it especially because I'd gotten polish on the grey and made it look a bit white and I can't bring it up at all.

Cheers.