I`ve never tried just a HP rinse...Is the HP rinse sufficient enough..[??!??] ...
With the obvious caveats/disclaimers about YMMV and how different locales use different stuff to combat winter...
*IME* it works fine. The Tahoe was just *AWFUL* and I do mean like "is that a silver one? Hard to tell..."
The pressure washing..with just water, plus the work with the Tornador, was enough to get it really, really nice. The caked white salt residue rinsed off the paint, the trim, everything except the tires (and most of it came off those). I was running warm, but not hot, water through the pw.
Yeah, I used the Tornador for still-nasty but that wouldn`t have been absolutely necessary; I really reached for that because of how it lends itself to the controlled cleaning of limited areas.
IMO, people using coatings oughta get at least the same results that I do. FK1000P contributes a lot, but doesn`t explain how I can do that on areas that have something else on `em. The Ultima TTG+, the frequent use of SprayWaxes and QD-strength IUDJ, that kind of trim regimen is, (also just IMO) highly beneficial and contributes to how well such areas clean up with merely the pw.
I`m trying to think of any weird/wildcard areas....OK, the sidesteps/running boards- I usually slime those with Autoglym Bumper Care and would generally expect that stuff to retain [winter mess]. Nope, cleaned up fine and incredibly enough the AGBC and ONR/IUDJ seem to play nice together.
Eh, "Situational Factors" must account for SO much of this...I`ll just count my lucky stars and hope that maybe my fortunate experiences can be of some help to others.
Noting that I really don`t like doing this stuff...I *am* genuinely looking forward to trying out my new siphon-feed cleaning gun

That, teamed with my older/smaller one, the Tornador, and the pw..teamed with the AirWand and the compressor for drying...oughta add up to a homebrew Touchless.
EDIT: FWIW, no the FK1000P/etc. are not fresh/recently redone. Last coat was a long, long time ago. The trim gets the spray-stuff treatment at every regular wash though.