If the Audi is anything like my Jetta the clear plastic bezel will be glued to the instrument cluster.
I've got what are probably cigarette ash/residue sitting inside my cluster from the DSPO but I'll just live with it because I don't want to end up purchasing an entire new cluster if I break the clear plastic. People do open them up to install the chrome trim rings around their gauges though. If you check around vwvortex there might be a thread for the Audi somewhere in the DIY/FAQ section showing what it entails.
PoppaJ does have a good idea with the compressed air though
