My Z had a musty AC smell and nothing I tried was able to fix it. It's definitely a job for the pros. That said, I dunno what procedure is best or where to have it done. Good luck Sean!
2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R