A buddy of mine worked at car dealerships. Over his time he picked up a device the dealerships use to remove odors from used cars. He had it set up recently on one of the rooms in his house. I asked if I could borrow it to use on some of my rooms. When setting it up I had the idea to hang some of my synthetic hiking clothes that have acquired 'that smell'. It worked pretty well. These devices are pretty costly. Something check out when you just want to surf the net. The device is an ozonator. It simply generates ozone gas. I look forward to responses form the community explaining how to build/buy one on the cheap.
Here is the site for the producers of the one I used: http://www.jenesco.com/