Hi, A couple of weeks ago I bought a used 1,1 Mac Pro and on the whole I'm very happy with it. The only problem is that it's a bit grubby. The aluminium is a bit tarnished and marked with spots. I've tried cleaning as best I can but the marks still remain. As anyone got any tips for making it sparkle again? I've noticed aluminium cleaner and saw a YouTube video of someone using stainless steel cleaner but I'd rather ask the pro's as I don't want to damage it. Any tips? Thanks. Glyn Jones.