There seems to be a debate over what liquid parraffin is
 
parraffin here it is what y'all call kerosene, but there is other stuff
= "liquid parraffin" which my vet  told me to give my cat to get rid of
furrballs. It is clear thick and non-smelly.
 
So ask your USA vet what they would use on furrballs and you have your
answer!
 
Steve Pearce
 
Kilspindie
Glorious Perthshire
Scotland