The last set I did - maybe 5 parts water, 1 part simple green. Be careful with simple green - if you leave them over night in straight simple green, it will dis-color the carb bodies.
I've rebuilt about 10 sets of carbs during my addiction to the CB. I have it down now after many different methods. Boiling them speeds things up immensely. I have 4 big coffee cans that I use for my carb cleanings. I have an old coleman propane stove and an old enameled pot that I use to boil the carb bodies (1 at a time) in.
The homemade soda blaster really works. Really. The carb bodies look brand new. Really takes no time. While I'm boiling one carb, I'm blasting the one that just came out of the pot.
You still have to remove all the jets and needles and make sure, really sure, that all the passages are clean. I use a combo of compressed air, carb cleaner and a fine guitar string.
Believe it or not, I clean them until I think they are spotless. Then, I do it again. When I go to start things up, I can eliminate any problems with fuel.
Carbs just can't be clean enough.