Try the EPA website for the DfE( Design for the Environment) here. If you have specific questions please let me know. I sell cleaning chemicals, some of which are considered “green”. Green is a weird little moniker for products in that there are no real across-the-board standards as to what makes a product “green”. To get a “green” approval a chemical manufacturer has to pay a fee to a for-profit company that has made up it’s own set of standards. These companies are self-regulated. Or, a manufacturer can go to the EPA’s DfE and seek “green” approval that way. No one has the exact same standards, but there are some common things that manufactures shy away from like phosphates, NTA, nonophenol ethoxolites and others of that ilk.
EDIT: Sorry Banjo, I guess I didn’t really answer your question. I have had good and bad experiences with both green and non-green products. The secret to any chemical, green or not, is how much technology and research has gone into producing something effective. it is quite possible to make a very effective “green” cleaning product, from floor care to commercial washer and dishmachine detergents.