Gone are the days of talking about Ozone for effective removal. It's a good tool for lighter lingering airborne odors but for deep down stink more is definitely needed. I've posted about them here before and moved over to them once having gone through some serious education on commercial equipment use for interiors.
I use Reset brand.
Reset Chlorine Dioxide | Safely remove odor, mold, mildew, algae
I've stepped up to a full commercial system that ranges in use from Automotive to Commercial buildings and Apartments. The only difference is in the amount of product used and a slight difference in it's actual deployment.
Chlorine Dioxide (ClO₂) is a chemical compound made up of one atom of chlorine and two atoms of oxygen. Do not confuse ClO₂ with typical household chlorine bleach or HTH. Chlorine dioxide is actually an oxidizing agent, not a chlorinating agent. Unlike alternative chemicals, ClO₂ reacts with organic matter through SELECTIVE OXIDATION rather than SUBSTITUTION. ClO₂ Is Non-Staining, Non-Masking, Non-Corrosive with No Fragrance, No VOCs, No Residue, No Wiping or Rinsing is required. Safely Neutralizes & Eliminates Mold & Mildew, Fire & Cigarette Smoke, Pet, Food, Urine & Rodent Odors, Perfumes & Chemical Masking Agents. Only ClO₂ may be generated and used as either a ‘gas vapor’ or ‘liquid’ in the atmosphere and on non-porous & porous surfaces.
Just place the tablet in 4oz water on a rubber matt or something to contain the splatter, put in a basic $12 battery operated aerator and let it go for 20 minutes. At the 20 minute mark start the vehicle and let its HVAC run in recirculate mode for 20 minutes.
A great Enzyme Product that I use is this one:
DEODORIZERS & ODOR CONTROL | Newline Industries