Solubilization of salts, proteins, nucleic acids, fatty acids, and the resuspension of inorganic micro and nanoparticles, as a chemical action on vinyl, requires that a surfactant be used to reduce surface tension to enable removal. The amount should be such that it leaves minimal residue. It's a tradeoff function, there is no free ride and none of this is rocket science. I happen to like RR fluids because I think the deigner hit the correct balance that does the job well. I have never been disappointed by the cleaning ability of these products nor have I ever noticed residue build up on my styli after playing.
