Thanks everyone for all the suggestions, I’m away at the moment but when I get home at the weekend I’ll upload some pictures. Before I put on the C4 trim restorer I used an APC and agitated it using one of those detailing brushes. I’m going to repeat that but use a toothbrush this time.
I don’t think is water stains as it would of come out by now I would of thought. I’ve been online looking around and it looks like I can replace all the parts for about €160 which isn’t that bad really. The only part I don’t like is how difficult it would be to remove all that trim. But, if I have to do it for it to be right then I’ll do it.
I’ve been looking at this website to get the parts;
https://www.lllparts.co.uk/_/product/vent-grille/mpn/5G0853677AF/. I’ve been using this site to get the part numbers but I’ll need to find an EU site to get the parts as I’m in Ireland. If anyone has any suggestions that would be great.