Plinth removed, slats discoloured?

[zafod]

I've just removed the number plate plinth and repositioned the plate below the grille. The slats that were covered by the plinth now look a darker colour (might be difficult to see from this pic but it is noticeable).

This is the "normal" grille (not bright).

Could someone please advise me as to the best way to rectify this so that the grille is uniform in colour (do I use a certain type of metal polish)?

Many thanks.

Edited by zafod on Sunday 16th December 17:20

[David W.]

My grille had started to look tatty and was ready for a re-spray, perhaps thats the answer.
DW

[anonymous-user]

I suspect that decolouration on the slates is from lack of cleaning as they were not accessible before. So perhaps rub down with some white vinegar to see if the darkness goes away?

[zafod]

soofsayer said:

I suspect that decolouration on the slates is from lack of cleaning as they were not accessible before. So perhaps rub down with some white vinegar to see if the darkness goes away?

Thanks. I'll give that a try.