I was sitting in the new TT for an hour reading the manual. I found it getting difficult to breathe. (with the door open) I went to the restroom in my home, washed my face, and my face was bright red...
Ok, try this. Put out several shallow trays (surface area counts, not volume) of COMMERCIAL grade ammonia. Close up RV and let sit a few days if possible, and having RV warmer is better. Then air it out. Bet it is MUCH better.