Tergitol 15-S-3, and Tergitol 15-S-9 Surfactants.
Post rinsing - maybe. Residue is so small likely inaudible, but some claim to hear differences. See Stereophile article which I find helpful. I’m not a fan of adding another machine especially with a large footprint to rinse like a VPI unit. Took a long look at the Record Doctor VI. Still on fence.

