Why does my Audi A1 often have an unpleasant odor when turning on the AC?

I've noticed that whenever I turn on my AC in my Audi A1, there is a strong musty smell that comes from the vents. It's quite bothersome and I'm not sure what could be causing it. Is this a common issue and how can I fix it?

This could be caused by a build-up of bacteria and mold in your AC system. It's important to get it cleaned and sanitized regularly to prevent this odor from occurring. I recommend taking it to a professional for a thorough cleaning.

I have had the same issue with my Audi A1. What worked for me was spraying some AC system cleaner directly into the vents and letting it run for a few minutes before turning on the AC. It helped eliminate the odor.