I had the same problem last year. I think the only thing that makes the smell go away is time. I sprayed them with scent killer before I walked into the woods last year, and then left any residule mud ect. on them. At the end of the season I stuck them in a tote with a fresh earth waffer and the smell is gone now finally. I think the human foot stink is more danagerous than new boot stink, so I wouldn't worry too much.