Out of ignorance, is the Maul hilt in question made from plastics or metals? I honestly haven't focused much on the various MR hilts and it's hard to tell from images if metals or plastics were used in the hilt and don't know how the metals , if used, would respond to the kind of metal polishing method I usually use.
BTW if you want the hilt, I can strongly recommend Cordaroyfog, I've dealt with him several times and he is incredibly honest, friendly and his products are topnotch. You would be hard pressed to find a better or more reliable source...