The good stuff was
Methylene Chloride AKA DCM or Dichloromethane. It's still a component of many paint strippers. If you can't find the good carb cleaner you can make your own by extracting the DCM from paint stripper with water. It's a very simple process. The DCM is not water miscible and will be the bottom fraction. Drain this off into a metal container and cover with some more clean water to keep it from evaporating.
OSHA and the EPA don't like this chemical so find the MSDS, read it, and make sure you understand it before use.
Edit: The last bucket (Gunk brand) I bought was from NAPA many years ago. They charged extra for a bucket with the basket. Don't do too much carb work anymore so it's still setting under the bench.