My garage is heated, but only has baseboard heat on one side of the garage (cuda side). I had 3 boxes of arm&hammer in the interior and for some reason thought it was a good idea to crack the road runners windows to let air move through. That's where I went wrong. My cuda was closed and I do drive that on occasion. I also keep my shop around 55 degrees.
I started to clean it today, luckily it hasn't been there for long so I don't think it is leaving any permanent stains. The first warm day we get before spring I'm going to push it outside and wash the whole car and let it dry in the sun.