mixer

Question

I have a machine called a vitamixer - it resembles a blender except you cannot take the blade out. Everyday we use it to make vegetable and fruit juices - no chametz is ever used - except a few (maybe 4-5 )years ago my husband tried mixing dough in it for bread - can it be used for pesach if we clean and pour boiling water into it. The container is hard plastic and the blades are stainless steel