Hi Carlbevo,
Not sure what Mk6 you have, but most of the 'bright trim' on window & roof rails (wagon?) is actually anodised aluminium, with the anodised coat extremely thin and easily scratched (they don't make them like they used to ...)
VW manual says not to use any polish at all on anodised parts, just wash off any grit and then wipe over(very) carefully with lots of water and mild soap/detergent.
Autosol makes a very good special anodised aluminium polish which will remove minor marks/stains, but use only very carefully with a clean damp soft cloth after the bright trim has been washed/wiped over thoroughly to remove any dirt/grit.
Hope this helps ...
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