most three piece wheel lips are polished / uncoated which means they will oxidize in normal atmospheric conditions. Most wheel cleaners cannot be used, as well as APC's, as they will stain the rim almost immediately.
I use soap and water most of the time to keep my Iforged 3 Piece wheels clean. I then follow up with a good metal polish (Mothers Powermetal, Simichrome, Wenol) and then seal with DP's Wheel Glaze. When wheels are super dirty and a wheel cleaner is needed, I use P21S Wheel Cleaner or Griots Wheel Cleaner as they dont stain.