The carpets and seats will need to be cleaned if you don't know exactly where the smell is coming from. Using baking soda then vacuuming, or spraying the car interior with vinegar will kill most of the odor. Steam cleaning the interior will work if the baking soda and vinegar leave some of the smell.
To get a milk smell out of car interior, you can use baking soda on the area and then vacuum up. You may also put vinegar on the spot.
Make sure the car is empty and clean. I use vinegar and water mix to wash off areas in the car--including the seats, dash and so on. If the odor remains, go to an auto upholstry shop and ask them to spray their enzyme spray that eliminates odors. It didn't totally remove the sour milk smell from my car (a gallon of milk leaked on the rear seat), but it certainly made it manageable.
There is a product called Zero Odor that when sprayed in the car will remove the urine smell.
Kerosene smell car carpet
you can clean the car or spray deouderent.
Burn The Car
You can still use the milk that has soured for recipes that call for sour milk, it will only make you sick if you drink it.
clear the mats in your car and spray an air freshner in your car
By purchasing a car with cloth seats.
Our sense of smell only smells each different smell for 7 seconds
Yes, when you drink milk and go outside and play in the sun, it causes the milk to go sour in your stomache, much like if you left a gallon of milk in a hot car.
soap hot water sponge and Clorox to get rid of the smell febreeze!