how can you clean BROWN ALUMINUM WINDOW FRAMES

I have a brown aluminum window frames (for commercial windows) im trying to clean they are oxized sorry i cant upload any pics
 
Maybe someone else can chime in and help, but have you tried F-13 from PressureTek? I know it works great on aluminum gutters.
gutters.jpg
 
Is it brown anodised or brown powder coat?? If it is brown powder coating give it a clean with a quality Auto paint cutting compound and apply a quality auto polish and buff to a shine. If it is anodising be very wary about getting chem's near it...You can chemically cut the anodising right off.. If it is anodising it could be just sun bleached and past it's use by date and the only way to fix it is replacement. Not all solutions to problems come in bottles of chemicals.
 
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