If your not afriad to tear it down totally, and you know exactly what surfaces you want to work on...
then you could use a fine soft rag with jewlers rouge on it and polish the surfaces out. ( bouns here is you can see the surface at all times, minus is that this isnt a fast process.)
You could also use a dremal with it's multitude of tips, but i'd recommend against it unless you really know what your doing. It would be very easy to remove too much.
my .02
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