Well, I stopped into one of my local Auto parts stores the other day to see about getting some SImple green. The guy said he didn't have any, but did have some stuff called "Purple Power" that would do the same stuff.
Here is a picture of the tarnished bowl, slider and top off of one of the K8 Carbs I am working on:
Before:
This is a pic of the bowl after a five minute soak:
And here is the aftermath with a little scrubbing with an old toothbrush:
I figure it's not too bad for $7 US for a gallon jug.