If you prep the surface properly and use the right soap, you CAN get amazing results.
My winter prep...
-Wash
-Eagle One clay
-2 coats
Klasse AIO
-2 coats Klasse
SG
-2 coats
Blitz
It's too cold now to wash in the driveway, but there's a coin-op place nearby.
I clean the car there, rinse, and race home.
I kick on my 25,000 btu heater for 20 minutes and my garage is tropical.
Then I detail wipe w/QD and...here's my point...the MFT's are NOT coming up dirty at all.
I do agree that if you just pressure wash, you can leave a layer of dirt...ever wipe down a "clean" car from a coin op only to find that you're wiping away that fine, invisible layer of
grime?
Properly prepped paint can "release" all the dirt w/out manual intervention.