We have the strangest odor in our TT...it smells like an ash tray! (That's my best description.) We bought our TT in March, obviously used from CampingWorld and we were able to go into it and look ...
Tricks from the refrigerator clean-up business. You can crush charcoal brickettes in a pan and put them in front of a fan on low, and/or soak cotton balls in Vanilla extract and leave them lying about on plates. I really don't know how these compares to the modern Fabreeze, and other odor eaters stuff we have nowadays, but it can't hurt.