How to prevent unwanted smells in my Audi 80?

I've noticed a musty smell coming from my Audi 80 and I can't seem to get rid of it. I have checked the usual sources like the air conditioning system and the trunk, but everything seems to be clean. Any suggestions on how to prevent this smell?

One solution could be to regularly clean your car's ventilation system. Dust, dirt, and mold can build up in the system and cause bad odors. You can use a special cleaning foam or take your car to a professional cleaner for this task.

Another common issue that causes unwanted smells is a clogged cabin air filter. If this filter is dirty, it can't properly filter out contaminants and odors from the outside air. Make sure to replace the cabin air filter every 15,000 miles or as recommended by your car's manufacturer.

Do you drive with your windows open frequently? This can also contribute to unwanted smells as dirt and debris can easily enter your car. Try keeping your windows closed while driving and regularly clean your car's interior and carpets.