I recommend water with washing-up liquid to scrub and kitchen towel to dry (with grease (elbow) aplication). Then, if a 'shine' is required I have very occasionally used Solvol Autosol (in fact I have just finished and replaced a tube bought in 1976!) but frankly it's overkill. The best thing about shiny box section aluminium rims is that the rim you can see reflects the light of the cars (or the dying sun) behind you.