I think I would limit the definition of a surfactant to a substance that reduces the surface tension of a liquid in which it is diluted, in this case of water. This allows the water to be "wetter", to penetrate better. Whether this also results in faster drying may be true, but I am not so sure it's a good thing, if so. If water plus surfactant (usually a nonionic detergent) dries, then it leaves a residue. In addition to isopropanol, my RCM concoction also includes a few drops of surfactant per gallon or so, and I usually use Tween20 or Triton X100. (I think Dawn is fine in this application, too.) But I always rinse with pure distilled water to avoid leaving a residue. My results have been better since I added the distilled water rinse cycle.