My wife uses the Green cleaners in Orchard hills Village center. Her main reason for using them is because the cleaning methods they use are less harsh or safer than regular cleaners, not so much that its better for the environment (although Im sure it is as well). I hope that helps. I cant tell you exactly what they do different. I just know she researched it.
Does anyone use the dry cleaners at WTC? I get the feeling they're hiding something since their place is completely bare and all their machinery and operations are behind a wall and not visible to the customers.