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Restoring/Preserving aluminum??

Greetings all

I'm about to move my satellite antennas on to a new tower, and 
would like to chemically clean them before they're re-mounted. 
I would like to use an aluminum treatment that prevents oxidation,
and preserves the antennas, but would rather not paint them. 

The antennas have been in use for 8 years and exhibit a dull finish,
but do not show any signs of pitting. 

Are there any spray or brush on aluminum preservatives available for
this purpose? 

I understand there is an acid that can be used to clean aluminum...has 
anyone tried this method of cleaning? 


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