The removal of air dried soil (dairy products contaminated with E. coli) from the surface of disks of several possible dairy equipment construction materials was determined by both radioactive tracer techniques and bacteriological methods. Both methods showed that cleaning the disks with any of the four types of cleaning compounds effected essentially complete removal of the contaminating soil from the surface of the molded plastics and various finishes of stainless steel which were tested.

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Author notes

1Presented at the 44th annual meeting of the International Association of Milk and Food Sanitarians, Inc., at Louisville, Kentucky, October 7–10, 1957.

Mr. G. L. Hays is Supervisor of the Bacteriological Group, Central Division Laboratory, American Can Company, Maywood, Illinois. He received the B. S. and M. S. degrees in 1932 and 1936, respectively, from the University of Idaho. He has been with the Research and Technical Department of the American Can Company since 1936. During this time one of his major interests has been the sanitation of dairy and food plant equipment.