I have got hold of some Beolab 6000s to connect to my Beocenter 8500. They are in good condition overall, but inevitably there are some shallow scratches on the back. They are the plain silver colour. I've been looking for anything suitable that might help - I know the scratches will remain but maybe there's something I can do to make them a bit less visible? You won't be able to see the back of them from where I intend to place them, but still, it'd be nice to tidy them u a bit. Any advice would be much appreciated.