Quality of milk froth is not up to standard.
For a perfect milk froth, use skimmed or semi-skimmed milk at refrigerator temperature (about 4° C).
Rinse after each milk based preparation. Place a recipient under milk outlet, rotate the milk regulator knob until CLEAN position.
After each use, disassemble the R. C. S. and clean all components in the upper level of a dishwasher.