Running into a problem with that, I'm thinking about letting the RAVE scoop and housing soak in gas for a while. I cant get all of the carbon off the scoop. Stuff looks like its welded onto the scoop.
If you soak them in a zip lock bag with a little ammonia overnight, the majority of the carbon pretty much wipes right off. If it's really bad it may take a couple of soaks but so much easier.