"Sticky residue"
I have shampooed with different Kirby systems many times, on more than just my carpets. I have never experienced this "sticky residue" that is all the rage of this thread. I check the carpets' drying-progress after they are shampooed, with bare (clean) feet, and have never felt this "sticky residue" at all. However, I, like Jeschbac, am a stickler for following instructions explicitly to the letter.
I have heard of "over-foaming" due to using too much Kirby shampoo... I wonder if this is where the "sticky residue" is coming from, using too much Kirby suds solution?