J.P.
I think the smell is probably in the carpets if washing everything didn't do anything. If you think it's still in the washables, you can soak everything in Borax for awhile before washing as usual. If it's in the carpet, the only thing you can do to really get rid of the smell is get new carpet and pad. If you can, remove the carpet a few days before it's replaced so you can smell around the bare floor. We had to paint much of the wood subfloor with Kilz primer to get rid of the smell. It was a big pain, but once the new floor was done, we were very glad we did it because it didn't smell at all! If you think it's in the walls too, I guess you could do the same thing. It's just a lot of work! Good luck!