I have a shiftknob made of leather and alluminum. The leather part is still fresh and the alluminum part is scratchless but it's a little dark already.

I polish it with glo or autosol and it will look like new again. But after a few weeks of use, it goes back to its dull color.

Is there a way to make it shiny for a very much longer period if it cannot be done permanently?

The shiftknob is already rare and considered a collector's item so I don't want to replace it with other brands. Though I still have a TRD shiftknob as a backup, I still prefer using the this one.

Thanks.