I had thought about 'Duraglit' (if you can still get it) or 'Autosol', or thinking a little laterally would something like Alloy wheel cleaner work? I appreciate that some 'cleaners' work on a chemical basis and need to be fully rinsed off, and others have an abrasive property.

I even thought of Coca-Cola but don't seem to have a 9m long trough and 50 gallons of the stuff to soak it in overnight!

 

Any advice before I waste money on an unsuitable product would be grateful.

 

Andy.

 

As the anodic coating on the aluminium is in effect a form of "decorative corrosion" your light abrading it with material such as scotch bright will expose fresh material to become oxidised as you do the abrading.

If you go mad and remove too much anodic coating dont worry just a light waxing with something like Pledge polish will stop it going all grey powdery for a season, just repeat the treatment gently each year.

 

Of course if you want super high gloss polish finish then you will have to revert to metal polishes and electro mechanical buffing to achieve that American Airlines Mirror finish alloy look.