Hi people hope someone could help! I've got a smelly old wet dog wiff coming through the vents particularly after the air con is switched off. I have checked to make sure no dog has worked itself into the air vents! Also i noticed the other night when i switched the car on the windscreen misted up for about 10 seconds then soon cleared. If the fans are off the smell is not there so it's definitely something to do with the vents, maybe mould in the ducts. I have tried the Comma air con cleaner from halfords. Works for about 2 week then the smell is back. I've also changed the pollen filter twice. It only smells in the summer months as well. Happened last year, Fine through winter. Now it's back again! Normally the smells I have encountered in cars is when the air con is ON and not when it is OFF which baffles me.