I use a pressure washer, but I use a foam cannon for the soak (which steps down the pressure by itself). For rinsing, I have a pressure regulator that attaches mid-point of the wand. I also use the widest fan spray possible with my rotating tip when rinsing the car.
No problems at all and the results are consistently outstanding.
https://www.ryobitools.com/products/details/46396024305
https://www.ryobitools.com/products/details/46396018007
__________________
Current: M2C, Miata RF-GT, RDX & Element // R1200GS & VRSCF
Previous: M3, Focus ZX3-S2, Superchaged Solara, Samurai, Integra, Pinto & RX-4 // VRSCR, R6S, FZ1 & FZ600