Wax removal from 3d models

I am an engineering student using PROJET 3D printer for my project. One of the problem that I am facing is I cannot get the wax out of the models even after keeping it in the oven, there is bit left in the models. I was wondering if there is any chemical process or any other trick to get the remaining wax out.

There's some discussion of this in the Engineering Tips forum: http://www.eng-tips.com/viewthread.cfm?qid=339777

Have you tried running the parts through a dishwasher?