I have untreated rims on my Jeep and over time they have become dull. So I took it upon myself to polish them. This was after I looked all over the local area to see if anyone did metal polishing.
I used a high speed buffer at 3400 RPM and a buffing bob. The polish was by Zephyr. I have attached a pic to give you an idea of what it looked like after.
I am now thinking that I will offer this as a extra service at a additional cost. Seems to be a niche in my area.