The Talking Machine Forum — For All Antique Phonographs & Recordings

I recently picked up a couple Amberola reproducers, (A & M). They've both sat around for probably 75 years or more and are pretty dull and dingy. However, aside from some very small areas of corrosion, there seems to be a "shine" hiding beneath the dull film. I tried some Fantastik, which removed a bit of dirt, but not what I'm hoping for. Is the dull finish just an oxidized layer of shellac or lacquer? If so, maybe alcohol or lacquer thinner to remove it? Then maybe wax? I sure don't want to use anything abrasive for fear of instantly ruining the oxide finish. So, want has worked well for all of you with shiny Amberolas & Operas? Thanks!!