All you need is a toothpick to clean most of the rez out, then you blow as hard as you can. Run a little hot water through it and your good. Chillums are cool in this aspect.
But people, remember to clean your pipes. I had a friend who had a pipe with quite a large bowl. He smoked out of the pipe for at least 8 or 9 months without cleaning it. He was a really big smoker, and the bowl cracked where you packed it. It was sort of funny, but sad at the same time :D