Home made ultra-sonic FI cleaner Options

[Mark Henry]

I had an old electric tool engraver lying around. I hose clamped the tip to nut and another hose clamp, and then I clamped it to a small Tupperware condiment container. I then put an injector in it and added FI cleaner till it just covered the injector.
Put on the top and plugged it in, it works great. I have cleaned a couple of injectors now including one with a seized pintle (sp?) that has now freed up.

[mightyohm]

Has anyone figured out the best fluid to put in these types of ultrasonic cleaners for parts cleaning?

I have an old ultrasonic cleaner but I never know what to put it in. I've tried several different things and they never work as well as I hope... I know you can buy solution too, but there must be a homebrew recipe...

I think the commercial fluids try to lower the surface tension (like acetone or alcohol) because that's what works best for the microscopic bubbles in the cleaner. Degreasers like simple green etc. are not supposed to work well because they do the opposite to help pick up the dirt.