Remove all ashtrays, cigarette butts, lighters, and trash
Vacuum seats, carpets, floor mats, and trunk thoroughly
Wash or replace floor mats
Clean hard surfaces with an interior cleaner
Wipe down windows, dashboard, door panels, and steering wheel
Shampoo fabric seats and carpets
Use a steam cleaner on upholstery and carpets if possible
Replace the cabin air filter
Clean or replace the air vents
Run the HVAC system on fresh air with windows open
Use activated charcoal bags in the car
Place baking soda in open containers inside the car
Leave the car in direct sunlight with windows slightly open if safe
Use an ozone generator only according to manufacturer instructions and with no people or pets inside
Repeat cleaning until the smell is gone
Avoid air fresheners that only mask the odor
Have the car professionally detailed if the smell persists