Polishing the headlight lenses will probably make zero difference to light output I'm afraid, the xenon units have silver coloured plastic "reflectors", they will now be black and not reflecting anything :/
I had new projectors fitted into my 2004 S4, bi-xenon units from a Lexus of some sort, made the output awesome. You can get aftermarket projectors now that bolt straight in I believe.
Still had to polish and clear coat the lenses, which didn't really last that well.
Short of a new set of lights, not an ideal answer I'm afraid!
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