can i use a transformer to run an american steam cleaner ( 120v/60hz) on a 220v/50hz
If the steam cleaner doesn't have motors on board you won't have issues going from 60Hz to 50Hz.
Anyway I think that will cost you less if you buy a new 220V cleaner and resell the one you have instead of buying a transformer (220V to 110V for that appliance)