anybody own an ultrasonic carb cleaner?

I have a 2.5 gal Branson unit and it works great but you have to be careful it will strip the plating off of parts and if you leave something like a Holley part made of zinc it will take the coating off and if you leave the part in to long it will disappear.
What solution do you use in it Brian? I have used Simple Green for cleaning tools (long story) but haven't done carbs.