From a website listed at bottom of article.

Method makes ecologically sound cleaning products. Last February, Method, launched an assault against Procter & Gamble's blockbuster Swiffer. Method's Omop, a sleek silver reusable mop, employs sweeping cloths made from corn-based plastic (PLA). Instead of clogging landfills, they're 100% compostable. Two years ago, they rolled out dryer sheets that use plant-based oil instead of the industry standard, beef fat. Method had a triple-concentrated laundry detergent a full two years before Unilever and P&G started crowing about all the water and shipping waste they would eliminate with their new concentrated detergents. Meanwhile, Method's were also nontoxic, biodegradable, and with packages more MoMA than Kmart.

You can link to this article:

http://www.fastcompany.com/multimedia/slideshows/content/fast50_08.html?page=35