Good Housekeeping wrote a rather interesting article recently about Green Drycleaning and compared its attributes to that of traditional drycleaning.  They defined traditional as cleaners using Perc.

I've been rather impressed with Good Housekeeping in the past, their articles about our industry are well researched and well written.  It started off very well, but took a wrong turn on a bad assumption.

They compare the solvents by using several types of fabric with several types of spots.  They then draw their conclusions on which performed best as a customer would by picking up the garments and checking to see which removed the variety of spots best.

They missed one really important part.  The solvent doesn't remove the stains in drycleaning any more than the water does in laundering.  In this respect they are the same, they merely offer suspension of the solids and the detergents are removing the soil.