For remjet removal, I use a solution of 2% borax and 10% sodium sulfite. Baking soda may work just as well. I haven't done any Fuji ECN-2 film, but I understand its remjet may clear a little easier than Kodak's. I always do the following:
* Soak film in the clearing solution for 2 minutes
* Drain out the solution
* Fill with water and shake the tank violently; drain
* Repeat the fill-shake-drain a few times until the water comes out clear
Then process (develop, bleach, fix, wash, final rinse/conditioner) and when hanging the film up to dry, wipe the non-emulsion side down with a cloth, sponge etc. (just make sure it's a material that doesn't scratch the film) to get the last remjet remnants off.
As to processing temperatures: ECN-2 film in C41 developer tends to give a bit of a contrast boost, so don't develop at ECN-2 temperature as that will make the contrast turn out too high. Start with C41 temperatures.
In my experience I never got good results with ECN-2 film in C41 developer (at least not for RA4 printing) so I would recommend ECN-2 developer instead. But many others report decent results with C41 developer, so perhaps it'll work for you as well.