Rub it down by hand w/ Mothers Mag and Aluminun Polish or any automotive compound or polish. You can even use toothpaste if needed. Rule of thumb as to scratches: if you can feel them w/ your fingernail, they cannot be removed w/ polishing. However, polishing will make it nice and shiny, hiding light scratches. Detailers can make anything work (paste wax, turtle wax, polish, compound, glaze etc) because they know the most important ingredient is elbow grease.