Modern fuels are hygroscopic, that is – they absorb water from the atmosphere. With the E10 (ethanol) additive your carburettors have to handle a toxic mixture.
Vapour blasting is a low pressure system for cleaning aluminium without damage. It is suitable for cleaning gasket surfaces.
During Ultrasonic cleaning the carburettor body is immersed in a water / mild specialist detergent mixture for a time, and at a temperature, which removes deposits from the internal passageways of the carburettor.