Find someone with a good o-zone filter - maybe you can even rent one. I have an Eco-Breeze O-Zone filter and it's way effective on moldy/mildew odors. I purchased a vintage set of encyclopedia's a few year ago and when I got them home they were grossly MUSTY! I put them in a room, set my Breeze o-zone filter on "sanitize" and closed the door. After the recommended amount of time I aired the room out..and the books were FUNKY SMELL F-R-E-E!!
I'm not an Eco-Breeze dealer, or affiliated with them in any way. I just know I've had mine produce some miracles! Another time I rented a place that had had a smoker in it. IT SMELLED SOOO BAD! I used my o-zone filter for 4 days, setting the levels up a little high when I went out and turning it down when I came back...and in a week there was not a TRACE of nicotine odor left! It never came back either.
Maybe you have a friend who has one. They are great!