On aluminum, I use a product that is no longer on the market. The Wax Shop aluma gloss. Very liquid, and little or no abrasive in it. On really rough aluminum/alloy I use #0000 steel wool followed by the AG. If you email The Wax shop, they may send you a bottle or two for free. They did for me. It even shines cad plating, not that there's any on decent road bikes, but.... Chrome, I usually soak the small parts in Chemtool, and then brass brush them.,,,,BD
So many bikes, so little dime.