I doubt you will have any warm car interiors for a few months.
Get a pan that the gun fits into (and your SO won't freak-out with you using to clean guns), remove any parts that can melt and prop the gun up so the grease will run out of the barrel. Pop it into a oven preheated to 200-250º and watch the grease melt.
When the melt is finished, (your call) remove and inspect. Remember
the gun is 250º. (read: HOT
Once the gun has cooled, then and only then wash the entire gun with Dawn dish soap. Blow dry and apply a thin covering of CLP or Cane's Mobil Mystery oil.
If that's confusing read this;
canebrake's 1911 platform pistol cleaning suggestions
I hope this helps, if not post more questions.