How do I get rid of spoiled milk/mold from car seat?

baking soda, and alot of it. Try coffee grounds vanilla, cinnamon, or essential oils. Peroxide perhaps, but it will bleach dark fabrics. If not get some carpet cleaner.

I had the same thing happen to me, 'cept the milk was pooled right around where my seat belt bolts down beside my driver's seat (the bottle rolled under the driver's seat).

First thing I did was use my carpet cleaner and got as much as I could out of there. Then I sprayed Febreze (that smell mixed with rotten milk is nausiating). The next day, I sprinkled down some baking soda, but that didn't help much. Then I was reminded of a trick my dad always used when he used to haul pigs in a semi, sprinkle down cinnamon, so I poured cinnamon on the spot, which thankfully covered the smell up. Then 2-3 days later I noticed the smell was coming through the cinnamon smell, so I vacuumed up the old and sprinkled down some more. and continued to do that for about 3 weeks, then the smell was finally gone.

Hope this helps!

An enzyme cleaner is all I can think of. I'd use Nature's Miracle, available in the pet supply section of grocery store or pet stores. Follow the instructions. Don't try mopping it up. Let it dry on its own. Put aluminum foil over the spot if you have to put the car set back.

rent a rug doctor with upholstery attachment. Steam works wonders!