98 Expedition - Oil in intake plenum?

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I took apart the plenum from the intake on my 98 Expedition 5.4 4x4.
The plenum appears to have a little oil lining the bottom of the plastic plenum. There was also oil around the plenum gasket and on the bottom of the intake manifold surface.
Is this normal?
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I cleaned the plenum with simple green solution.
Should I clean the intake ports with something, or just leave it as is?
Whatever I would use would probably need to be a spray, since the ports are hard to reach through with all the curves.
Another option would be to submerge it in a cleaning solution in a large deep pan or bucket
 
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