Just purchased a Lyman Turbo Sonic 2500 Ultrasonic Cleaner 115V. If you own one how do you like it. Good things and bad.
I don't know about spray guns at all but I imagine it'll work perfectly. It works very well on gun parts; just remember it will take off everything including the stuff in places you can't really reach so be sure to oil everything thoroughly when you're done or it will corrode in short order.Going to use it to clean internal gun parts and the ocasionally my minijet spray guns.