I used to have a hookah with the stem welded on too. I found a great way to clean it too...
I took and old sock with a bunch of holes in it and cut it into strips. I then tied a long piece of twine in the center of a strip of sock cloth. You then lead the twine down from the top and out the stem pull it through and the cloth at the other end will clean it as it comes through. (make sure the sock is clean you don't want to smoke toe jam
I was inspired for this cleaning method by watching a guy clean a saxophone with a piece of cloth attached to a cord..