I sorta cleaned out the connecting hose. But since the hose had a couple of ells in it, I could only see into 80% of it, and it's only 7 in long. I didn't blow though it because, well, it's oily. But, it was relatively clean. When I put it all together and started up the car, I got the check engine light. After resetting it a couple of times, and still getting the check engine light, I took it all apart. This time I did try and blow though the hose and it was plugged!

 

Lesson: You have to check everything. And yes, the check engine light went away.

while replacing my pcv, i cleaned the curved hose and i also replaced the lower hose between the block and the plastic t - it was rock hard and developing cracks. 5/8" emissions hose works but its a pita to get onto the pipe sticking up from the block, after about ten minutes of shoving and a couple bloody knuckles i used a razor to cut a chamfer in the bottom end of the hose and still had to fight it. woulda been nice if anyone local carried something a bit bigger...