Sounds like you've got an exhaust leak on the Mopar. And, the GM as well.
The Fusion is a good safe car. Turtle wax Oxy upholstery cleaner is needed. Will take several applications! Have fun.
yes the mopar leak will be fixed at exhaust shop the GM is another story a lot needed. long list... yes we have been using oxy on the seats and she is getting better.. thanks again