avoiding chelate blush

Q: We have insect and proteinaceous residues we are looking to remove from an aluminum drum.  We know Tergazyme is the “go-to” for such things but we seem to get aluminum chelate blush.  Can you recommend something different?

A:  A chelate blush is a white crusty irregular deposit of aluminum edetate, a reaction between the aluminum and the chelating agent in some Alconox, LLC detergents. You are totally correct to try a protean enzymatic detergent.