the best pit stop is to call Vpi. There are plastic stores that do sell polish and might help but Vpi is still your best bet.
Removing fine scratch marks from VPI plinth
I've searched the forums and haven't found a thread on this much to my surprise. Just wondering out there how VPI owners of the acrylic plinths of the Aries series tables and the HRX's clean their shiny black plinths and remove those hairline surfaces scratches that can accumulate over time.