The Kirkland Signature Gel (Costco) is part of the dishwasher detergent
test program at Consumer Reports. In our lab tests, dishwasher detergent
models like the Gel (Costco) are rated on multiple criteria, such as those listed below.
Liquids and powders generally pour easily; gels have a thicker consistency than liquids. Tablets are a dry, solid premeasured amount of detergent. Pacs have a dissolvable outer package containing a premeasured amount of liquid, gel, or powder. A dispenser product uses a cartridge that automatically dispenses a charge of detergent for 12 loads of dishes.
Size of package:
The package size in ounces for liquids or powders or count for tablets, tabs and packs.
Gauges how well a detergent removed a caked-on puree of foods from glass dishes.
Features & Specs - Kirkland Signature Gel (Costco)
Contains bleach Based on the package ingredients list and other package claims, some detergents include bleach in their formulas. While the presence of bleach has not seemed to act on the baked-on soils in our tests, it might help with tea or similar stains.
Contains enzymes Based on the package ingredients list and other package claims, most tested detergents have enzymes, which can break up food for easier removal.