Crud in the vent, how do I get it out?

I'll tell you how I plan to do mine. It has some surface rust in the cowl area.....thank goodness no worse than that. I plan to eventually remove the fenders as I do the body work. Once removed, I am going to cut access holes on either side of the cowl so I can get in there and blast the rust out epoxy prime the hell out of everything and then paint it. I'll probably paint it with a heavy coat of Rustoleum black.
Please post picks once you do this, I would like to see.