HB gets it right for sure - Magic Eraser will take any dirt off and most stains.
Obviously I'm not Zen~, but the first solution that comes to my mind is:
buy two Kabukii.
buy one blue 510 version, and buy a P3 version...then, swap out the base and bottom O-ring, and boom. Blue P3 Kabuki.
As far as keeping the Ghost White clean?
Mr. Clean Magic Eraser comes to mind. Those things will take anything off anything!