The Kirkland Signature (Costco) Ultra Clean Liquid is part of the Laundry Detergents test program at Consumer Reports. In our lab tests, Laundry Detergents models like the Ultra Clean Liquid are rated on multiple criteria, such as those listed below.

Body oil: Indicates how well a detergent removes body oil or "Sebum".

Dirt: Indicates how well a detergent removes dirt or "Clay".

Salad dressing: Indicates how well a detergent removes salad dressing.