Yeah, I've used it...and wasn't impressed. I think SG is cheaper, better, and safer. No...I know it.
Don't go that route. If you already bought it, use it to clean your frame or something. Not the engine--so you had the right idea. The pressure washer should be fine as long as you're careful. Start a bit away and using a lower pressure nozzle if you can, then learn your limits...
4.2L V-6 manual
Leer camper shell
plenty of strobes.... Yay for Firefighters!!!