Could not hold back here.
Deicing the S-92, or any other rotor, is, as Nick points out, a matter of encouraging the ice to shed when you want it to rather than preventing it or melting it.
To actually determine when to shed the ice is a matter of determining what size chunks you wish to shed. Once you determine that, the cloud water content, drop size and temperature tell you how often to zap the blade. -i.e the time and timing vary with conditions to keep the pieces the same size.
Then you show those pieces can't hurt you if they hit - and voila! you have a deicing system - be it Super Puma, S-92 or AW139.
Note - the 609 has anti-ice.............