Back to being serious, most of the funky smells in the cab come from the aircon. I use one of the aerosol aircon cleaners a couple of times a year. Pick them up in EuroCarParts for under a fiver. Personally I hate air fresheners either in the van or house, it’s just replacing a set of naturally occurring chemicals with a load of artificial cr4p. But that’s just my opinion. I’m the guy who’s stomach heaves at “new car” smell.
