When I was working in the chrysler dealership we used to get a spray for removing the musty mildew smell from the cars after the evaporator leaked freon. Believe it or not, it was called "stink away" and it came from the local Napa store. It was also recomended for those nasty dead mice smells that come from the heater fan from some customer every spring. I don't know if it is still available. It did smell a little bit like a talc powder , almost a baby powder smell.

Kenny B