Pressurized parts washer

I just finished cleaning a set of lathe change gears and feel that there
has to be a better way than a brush and solvent. I tried ultrasonic in
a solvent bath and I still had to brush out the teeth roots and it was
slower than I'd like.
What I thought was to make a pressure washer for parts. Not real high
pressure like a real "pressure washer", maybe 100 - 200 psi. Not as
much flow either - .25 - .5 gpm. I'd need something like a sandblasting
cabinet to keep down spray.
But ... maybe there's a reason why people don't do this. Or do it
commonly. I've never heard of one and I just Google-grouped RCM without
finding anything.
1. Do these things exist? If not, what do you suppose the problem is?
If so, what are the operating parameters (psi & flow)?
2. ELSE: if I were to build one anyway, do you think 100 - 200 psi and
.25 - .5 gpm are good numbers? Can you think of any gotcha's to worry
about?
Thanks,
Bob