Kirkland Signature UltraClean Laundry Detergent

Kirkland Signature UltraClean is a premium liquid laundry detergent specifically marketed by Costco. As a private-label brand, Kirkland Signature products are manufactured through strategic partnerships with established industry leaders. For their liquid detergent line, production is heavily centralized in the United States, often utilizing facilities owned by large-scale chemical manufacturers such as Henkel or Sun Products (which became part of Henkel), ensuring consistent quality and performance that rivals major national brands.

Founded in 1992 in Issaquah, Washington, the Kirkland Signature brand was named after the city where Costco’s headquarters were located at the time. The brand is designed to offer high-quality alternatives to brand-name products across various categories. Today, the brand remains a wholly-owned subsidiary of Costco Wholesale Corporation, one of the world's largest retailers. The brand represents a significant portion of Costco's annual sales, maintained through a global supply chain that balances American manufacturing with international distribution to serve their worldwide membership base.