Wow, that back to black stuff works wonders, thanks for the tip!
Even though the title of it suggests otherwise, would it work on consoles that aren't black, like grey or white etc? It seems to be a standard protectant/sealer/moisturiser so surely that would benefit consoles of a different colour. I mean, it doesn't actually 'paint' or stain the console black, does it?
I have some more tips. Go to any motorcycle store and pick up a product called Plexus. It comes in a can and is a spray. This stuff is a miracle worker, protects and seals and leaves a nice coat to prevent further dirt accumulating. It does a FANTASTIC job of restoring dull/faded surfaces too.
Re scratches, one secret tip that I have is to use a ceramic cooktop cleaner. They are a cream/paste and come in a container that has a foam applicator. This WILL remove light surface scratches and will certainly help reduce deeper scratches, but it won't remove them completely.