Oxidation of aluminium causes the metal to corrode and begin to flake. The best way to prevent oxidation of aluminium is to apply a polish. However, after a while polish will begin to wear away in places, particularly if it is a cheaper polish. When this happens, the exposed aluminium will once again suffer from oxidation. To avoid this, use a rust-preventive polish or spray and reapply it regularly.
Rub the aluminium surface lightly with a scouring pad and warm water. Make sure to remove any traces of rust from the surface. Dry the aluminium thoroughly with an old towel.
Apply a rust-preventive polish, such as No-Wet, to the aluminium. Reapply the polish every six months, paying particular attention to areas where oxidation occurred previously.
You may also spray a rust-preventive treatment, such as WD-40, over the aluminium. The spray will prevent further oxidation from occurring. Reapply the spray as needed.