Iam Service Manager at Ford Store. Smell is likely bacteria built up from ac mostiure that clings to evaporator and heater box. There is a ac service available that introduces a chemical in the air intake. It kills the bacteria. If really bad you may have to have dealer to twice in a few weeks. We charge 139.95 and have it as a scheduled maintence item every 40,000 km. If you live in a high mostiure area.. (Coast) you may need it every 20000km. Also when you use defrost it cycles your ac to dry the air. If you use defrost or defrost mixed mode as a regular setting you will have to clean more often. If you use just heat on GH poor or vent it helps dry the heater box.
DO not use Lysol.... You have to breath that stuff...
Replace your cabin filter. Have the service done. Remember if it is really bad or could take 2 or more treatments.
Hope this held