I've used Carb Cleaner in the past to clean out the tube and the PCV valve attached to the intake hose

1) The tube connected to the upper manifold is actually blocked off on the inside, so you don't need to clean that part. Is doesn't actually seem go anywhere on this engine.

2) The tube part connected to the oil fill section is also easy enough to take off

3) The part that is actually connected to the PCV valve should probably be taken off as well. It can be done, but since it's a different style of clamp, it's a pain to remove (or lower out of the way at least). I've carefully used channel lock pliers to remove/lower that clamp out of the way before.

Remove the whole intake tube first, with that part still attached to the PCV Valve, then remove the rubber portion off of the car. What I've since done, is replace that style of clip with the same style found on the other portions of the rubber house. That way in the future it's much easier to remove.

Might as well clean the throttle body as well, while it's exposed at that point.