Ally polish/don't polish?

[Mark 4.3]

Finally got my pre-cat Griff friday, just in time for rush hour traffic & rain. Entertained half the M40 crowd, as I had to stop on hard shoulder and struggled to extract roof panel from boot ! Sixty quid of petrol later, I am totally hooked. Anyway, spending some time giving the car a good valet, and fancied polishing the window A-frames and door handles with a standard metal polish. Does anybody know if this is OK, or are these bits lacquered??