I am in charge of vehicle cleaning of one of our cities public transport fleets and have a few Chevy 4500 (Duramax) with 19. 5 inch Alcoas, they are begining to get very dull and ugly, I have been trying different products, some work better then others, I was wondering if anyone has a product they use on Alcoa or any other alluminum rims to bring back the shine. Tools? By hand? What's your preference? Thanks for any advice or info.