Remove all trash, food, and damp items from the car
Vacuum seats, carpets, floor mats, trunk, and crevices
Wash or replace floor mats
Clean all hard surfaces with an interior cleaner
Shampoo fabric seats and carpets
Wipe leather seats with a leather-safe cleaner
Sprinkle baking soda on carpets and seats, let sit, then vacuum
Place activated charcoal bags in the car
Use an enzyme cleaner on organic odors
Clean air vents and replace the cabin air filter
Check under seats, in the trunk, and in storage compartments for hidden odor sources
Leave windows open and air out the car
Park in sunlight with windows slightly open if safe to do so
Use an odor eliminator spray designed for cars
Replace or clean any contaminated seat covers or liners
If the smell remains, have the car professionally detailed