Need suggestions on cleaning 5052 4x8 sheet aluminum oxidized spots

[MetalWolf]

Guys i could really use some help with the best way to clean oxidation spots off some 5052 aluminum sheeting. It was covered to protect it from some recent rain but either condensation got between the sheets or the rain found its way through the plastic and it left some looks like hard water deposited and i could use some serious advice on a cleaner I have a little over 25 sheet hung didn’t think it was any big thing but was wrong wont come off as easy as I thought it might.

so some professional input would be greatly appreciated.

[another2centsworth]

White rust. I had some on my galvanized siding 2 yrs ago. Size about 1 ft by 2 ft.
I scotchbrited it then re scotchbrited it with picklex 20. Wiped off excess after about a minute. Let it sit for a few hours then shot it with 2 coats cold galvanizing. I did it mostly for a field test. It has not changed exposed to the elements and looks the same as the day it was treated. Good Luck.

[MetalWolf]

Unfortunately that’s not an optional process for cosmetic aluminum sheets