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No more oil than is shown in the photo, I wouldn't worry about it. If enough gunk accumulates to prevent the throttle butterfly from closing completely (thus affecting the butterfly stepping motor/positioner signal to ECU), then you should probably clean it.

If you've never had your PCV system apart, that is probably the better place to spend your cleaning efforts (especially if your valve cover gasket is seeping oil like most I've seen, including mine).
 
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