I think sometimes education can get in the way of real world solutions to problems. Personally, I don't give a s--- about the chemistry of the products I use. I don't think most of us here do. Who needs a full time study on the interaction of presprays and rinses. All I care about is which product does a better job cleaning carpets. If Rob does a test of presprays, I for one trust his common sense to conduct the test in such a way as to fairly compare dozens of products. I'll leave the details to the chemists. That being said, if TMF's products finish 1-2-3, I may be a little skeptical. Thanks for taking the time Rob.