Hi mate. I have this trim http://www.audi.co.uk/content/dam/au...ides/a3-s3.pdf on page 40, the medial aluminium and I'm after wood. My cars an 05 sportback but with the non-smoking kit (no ashtray) car's done 45000, so it's pretty clean. there are a few tiny spots near the driver's shoulder where I presume the seatbelt has been let to tap against it.
BTW, the trim just unclips with a plastic tool of some sort to prise it out without scratching it.