Green Products Please 
Are you thinking of Lime-A-Way? I don’t think it will work on grease, but it’s the only green cleaning product I can think of.
Some sort of orange based product would be my suggestion.
Something along the lines of this
http://www.northerntool.com/shop/tools/product_200325313_200325313
If Simple Green is actually green than it would work. The concentrated stuff can degrese a car engine.