DonoBBD, i see diversey lever is now johnson/diversey?

They have a diver spray "low foam blended caustic detergent for food and beverage CIP" I assume high ph, Caustic

Then they have a oxofoam chlorinated foam cleaner that has mix of caustic and also contains hypochlorite (acidic?)

Are you thinking it is the oxofoam product? It says it is for use on stainless steel but not softer metals like aluminum?

These don't look quite right. MAybe it was an oven cleaner?