I bought a Little Big Shot nozzle, I have no vested interest whatsoever, but I felt compelled to share my experience.
It's an itty bitty brass nozzle, (MADE IN THE U.S.A.!!!) that I bought from a big box hardware store for about $10.
It is the best I've ever used for high pressure use, & I've bought plenty of different ones at ridiculously higher prices.
I just used it to wash off all the winter road crud off of my 4WD pickup, (along with a good deal of rust & paint ) and it works great!
I highly recommend it.

 

Thanks, sounds like it would work great for cleaning parts.