Mike, when I got my Crest ultrasonic cleaner a few years ago I did a ton of research at different forums. One cleaner that popped up many times was Extreme Simple Green Aviation (part # D6-17487) .
Don’t know how it compares with regular Simple Green, but I’m extremely happy with the results. I use about 15-20% cleaner / balance water. I have included a before and after shot of a 15HP Evinrude piston.
Good luck,
Bob D
