Naphtha for cleaning carbs and fuel pumps

[FrankWest]

I have a large ultrasonic cleaner I used to us for large clock movements. Worked great on them but then I used a very expensive clock cleaner without ammonia.
Ammonia is used in many new clock cleaners and it actually eats away at the metal, and the last thing you want in a clock cleaner is to have it eat away at crucial parts like bearing and teeth. But I am not sure this cleaning solution or Ultrasonic cleaning would dissolve the hardened gunk in a carb or furl pump. Ulsonic cleaning basically clean dirt that IS stuck to the moving parts it does not really dissolve deposits. I think the Naphtha or lacquer thinner does that kind of dissolving