I use Zep 680-T2.
Purple is not safe for Mg or Al.
Same for the usually available Simple Green - although Simple does make an Al safe formula that is also biodegradable.
http://industrial.simplegreen.com/ind_application_zone.php?industry=AEROSPACE&application=ALUMINUM+PARTS&view=pdf&tip=5
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The souls of the righteous are in the hand of God, and no torment will ever touch them.
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