We have used an industrial strength ozone blaster to clean two cars with strong mildew/dirty dog smells. We let the ozone blaster run for 24 hours and then the ozone dissipate for 24 hours because it is like air bleach- extremely hazardous to breath full strength. The car smells fresh and clean afterwards.
A small cigarette-lighter plug in ionizer does the same thing on a milder basis over a longer period of time.
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