Yes. I removed the head from the supply pipe and poured white vinegar through it from the supply side. Then I soaked the head in vinegar for 6 hours. It looks sparkling clean, but the spray streams still glomp together instead of being separate streams. I also traded it with another shower head (identicle model) from a different shower in the house and the problem follows the head, not the water supply source (rules out pressure and/or delivery rate being the problem). I'm thinking that I may have grit stuck in the inside. I thought about trying to push a fine wire through each stream nozzle from the outlet side towards the supply, but looking at the face of the outlet makes me believe there is a lot of plastic inside. I would prefer to take it apart, but I'm not sure how.
Thanks for your suggestions though.