Try placing the machine in a large Rubbermaid tub or box and place a bowl of white vinegar inside. Close it up for and replace the vinegar every other day until the smell is gone.
I used this vinegar trick to get rid of a really bad odor that was left in the back of my truck. I have a canopy shell and a Bedrug while transporting Chili Palmer (my dog) back home after living with my sons for a while. She smelled really bad after sharing a backyard with two male dogs.
I closed up the windows in the canopy and placed a quart sized bowl of vinegar in the back and changed it every other day for a week and the smell vanished.
Our son used this trick to get rid of old dog odors in his newly purchased house. After having a professional cleaning crew come in, shampooing carpets his house still had an odor. This got rid of it.