My builder's guy used a PC to polish out marring on a stainless steel vanity top (garge bathroom) that got damaged by some subcontractors, so the UDM oughta be able to do it too.
I dunno for sure what he used, but it was a series of abrasive discs, pads, and compounds made specifically for polishing metal. FWIW, I should point out that he spent basically an *entire work day* doing the job, this wasn't something that was over and done with an a few hours.