I've seen alloys refurbed. A mobile specialist will normally grind out any scratches, prime, paint and then lacquer them. Don't know if they can repair dents though. I've not had mine done yet but I've had a quote for £70 a corner.
If you send your wheels off, they should chemical dip them before priming, paint and lacquer.
If you send your wheels off, they should chemical dip them before priming, paint and lacquer.