The Kirkland Signature (Costco) Dishwasher Pacs is part of the Dishwasher detergent test program at Consumer Reports. In our lab tests, Dishwasher detergent models like the Dishwasher Pacs are rated on multiple criteria, such as those listed below.
Cleans dishes: Gauges how well a detergent removed a caked-on puree of foods from glass dishes.
Cleans pots: Indicates how well a detergent cleaned pots that were covered with baked-on macaroni and cheese.
Resists water spots: Shows the ability to prevent water spots on glass plates.