I had a gallon of milk (all of it) spill on the carpet of my car. I tried everything to get the odor out. Finally i remembered that white vinegar will remove just about any protein odor. I emptied a 1/2 gallon of the vinegar onto the carpet (I was desperate...it was summer) swished it around a bit, rolled down all the car windows and waited. The next day...no odor! and the carpet was dry by that evening.
If it's in the carpet or upholstery cover the area with baking soda(it takes quite a bit) and let sit overnight. Vacuum the next day. If the smell is throughout your car put an open bag of charcoal in your car/trunk for several days. Good luck, I know from experience what a sickening odor that is!
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