Pulled the manifold and there's a good bit of dirt.. on par with pictures others have posted. A difference in my case however, is that where the injector ports on the manifold mate with the head, they have some gunk that I'm having trouble getting rid of. It appears somewhat crusty and isn't all over the entire surface where the gasket seals.

Do I need to clean that gunk up? and any ideas what might work better than intake cleaner with paper towels?