Danny,
Your post makes it sound like pH has some correlation to resoling. You do know that is untrue, don't you?
Yes, presprays do contain the highest level of surfactants, of all your cleaning agents, and residue from sticky surfactants is definitely the number one cause of resoiling.
pH is the measure of the relative alkalinity/acidity of the water based cleaning solution, and only a very select number of pH relative components would have any relevancy to a sticky residue, and none are used in any typical "apartment" presprays (i.e. citric acid).
One must not think that the acid component of any acid rinse is for removing sticky residues. The acid component is for pH stabilization, yes. But only properly formulated rinses also have another separate component for removing sticky surfactant residue. The sad truth is that many don't. In essence,, most of the mediocre acid rinses are nothing more than soures relabeled and sold as rinses, when they are actually very poor rinses. it is no wonder that many carpet cleaners poo-poo acid rinses, and rather use a clear water rinse. These guys have never even experienced a good rinse product worth a darn.