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1

I have exactly the same 'stains' on my 2003 Centaur Ergopower levers, which I also attributed to the layer of anodization wearing off. It is not corrosion. Different thermal expansion rates of the oxide and the alloy underneath could damage the layer of anodization. Not sure if the presence of mildy acidic human sweat could accelerate the process ...


2

I don't think you can. It looks to me like the anodized surface layer has worn off, exposing the plain aluminum.


2

you can try to use caustic soda. It will melt down the aluminum. But you have to be very careful. Watch this video


0

Sometimes your just lucky. Soaking makes sense.maybe its the concentration of amonium,2-3 percent in regular store.they make 30-50 percent concentrated also,use outside only is you find it.There are sources online for liquid fertilizer 82-0-0,but has some sulfur;hope to try.



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