"Green" Chemicals

I run a 3-yr old 3-Bay touch-less automatic and I am trying to decide whether to change over to all Green Enviro-Friendly Chemicals. My chemical distributor set up one bay with the Green chemicals, and it's working out OK, not great. Supposedly, we use less Green Chemical per vehicle, but at a higher purchase price, so "value-wise" it all evens out.

My customers don't seem to care whether it's green or not. They just want a clean car. Our current soaps are doing well and I'm hesitant to change over all bays. Do people really care that much about Green? To me, we are already "Green" since we dispose of our waste water properly, unlike people who wash at home. I'd appreciate your views.