Polishing is the act of Cleaning. On paint you should "Polish" once a year after the vehicle is about 3 years old. This is the preperation for a Sealant.
Rims (Polished Aluminum) should be polished twice a year.
Chrome & Glass should be polished 3 times a year.
Deoxidizer is a serious Cleaner/Wax, in essence: "A Polish"
Clay is the "Ultimate Polish" See Clay catagory