Aluminum wheels are used by automotive manufacturers for factory wheels. They are also widely used in the aftermarket wheel industry. The problem with aluminum wheels is that they are a soft metal and prone to pitting over time. Pits cannot be wiped off or cleaned since they occur when the clear-coat finish on the aluminum wheels is damaged or worn down. It is possible to restore or recondition pitted aluminum wheels in less than a day, however.
Sand the wheels with 220-grit sandpaper. Sand the entire surface but focus on sanding the pitted areas until they are smooth. Rinse the wheel to see your progress.
Sand the wheel again using 400-grit sandpaper and water. Keep the sandpaper wet while you are sanding the wheel. Smooth the surface by sanding evenly over the entire wheel. Rinse the wheel to check your progress when you are finished sanding.