Yep Nutech, my heart did skip a beat. Slurry is good stuff. Matter of fact, Joel and I were just talking about that the other day. I wouldn't use it as a prespray, but it's the best damn emulsifier ever invented. I started out cleaning with nothin but slurry. True story
As for the poly, depends on which poly it was. There are three major polys. You probably did have the poly-p which is the best of the polys. The ones that you are used to not getting clean are usually the p.e.t. polys, bad bad stuff. In all three cases they are all oleophylic, meaning they love oil. In the case of the p.e.t., the oil actually eats the carpet. No chit.