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National Geographic's Green Guide had a good article on dish soap this month. They ranked them according to how completely the company discloses ingredients, so that the consumer might discern how many are plant-based, how many are harmful additives, etc. At the top of their "honesty" list was Seventh Generation's Dish Liquid, which got three "G's". At 2 (for using generic terms like 'preservative' or 'surfactant', although these were certified low- eco impact by an independent agency) were Clorox Green Works (Natural Dishwashing Liquid), Ecover (Dishwashing Liquid), and Planet (Ultra Dishwashing Liquid Gel).
Receiving 1 'G' for generic ingredient names and a lack of independent testing were Biokleen dish liquid, Earth Friendly Products (Dishmate), Method (Ultra Concentrated), and Mrs Meyers (Clean Day Dish Soap). D'oh!
The label vaguery doesn't necessarily mean that the companies in question have something to hide, but I'd encourage them to spell things out as much as possible. Trade secrets are important, sure, but so is knowing what we're buying.
Incidently, SG has coupons on its website, and you can stock up in bulk on Amazon.com